RWC Music Database: Popular, Classical, and Jazz Music Databases

RWC Music Database:Popular, Classical, and Jazz Music Databases
Masataka Goto

Hiroki Hashiguchi

National Institute of Advanced Industrial Science and Technology (AIST)& “Information and Human Activity”, PRESTO, JST
IT, AIST, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan

4-31-1 Naka-Ochiai, Shinjuku-ku,
Tokyo 161-8539, Japan

Mejiro University

Takuichi Nishimura

Ryuichi Oka

National Institute of Advanced Industrial Science and Technology (AIST)
CARC, AIST, 2-41-6 Aomi, Koto-ku, Tokyo 135-0064, Japan

University of Aizu
Aizu-Wakamatsu, Fukushima 965-8580, JapanABSTRACTThis paper describes the design policy and specifications of theRWC Music Database, a music database (DB) that is available toresearchers for common use and research purposes. Various commonly available DBs have been built in other research fields andhave made a significant contribution to the research in those fields.
The field of musical information processing, however, has lacked
a commonly available music DB. We therefore built the RWC Music Database which contains four original DBs: the Popular Music
Database (100 pieces), Royalty-Free Music Database (15 pieces),
Classical Music Database (50 pieces), and Jazz Music Database(50 pieces). Each consists of originally-recorded music compact
discs, standard MIDI files, and text files of lyrics. These DBs are
now available in Japan at a cost equal to only duplication, shipping,and handling charges (virtually for free), and we plan to make themavailable outside Japan. We hope that our DB will encourage further
advances in musical information processing research.

1. INTRODUCTION
We believe that research into musical information processing will
be advanced if music databases (DBs) become available that can beused by various researchers. The main purposes and advantages ofsuch commonly available DBs can be summarized as follows:• Researchers will be able to use the DBs as a common benchmark for comparing and evaluating various methods related tomusical information processing. The lack of common music DBs
available worldwide for research purposes at almost no cost has
made it difficult to establish benchmarks (evaluation frameworks)
for much of the research done regarding musical information
processing.
• The DBs will accelerate the progress of various forms of researchusing statistical methods. Recent progress in the use of statisticalmethods in other research fields such as speech recognition has
been largely due to the availability of large DBs.
• Researchers will be able to use the DBs for research publication and presentation without conventional copyright restrictions.
It has been difficult to demonstrate research using copyrighted
musical pieces that will be included in, for example, conference
videos and CD-ROMs.
Although there is an enormous amount of music available on commercially distributed compact discs, it is difficult to use this music for the above purposes because of copyright issues. Commonly
available DBs with copyright-cleared pieces are therefore essential
to encourage the healthy development of this field of research.
Various commonly available DBs have been built in other research fields since the importance and significance of such DBs havebeen widely recognized. In the research field of speech information
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c 2002 IRCAM – Centre Pompidou
processing, for example, many DBs (corpora) have been built. Furthermore, recognition of the need for commonly available DBs has
led to the creation of the Linguistic Data Consortium (LDC) in theUSA and the European Language Resources Association (ELRA)
to support the development and sharing of resources. There are also
several DBs in the field of image processing. On the other hand, inthe field of musical information processing, there is no commonly
available music DB containing hundreds of musical pieces.
We therefore have built a music DB — the RWC (Real WorldComputing) Music Database — that gives researchers freedom ofcommon use and research use. (The DB is intended to be used onlyfor research purposes.) The RWC Music Database is composed offour original DBs: the Popular Music Database, Royalty-Free Music Database, Classical Music Database, and Jazz Music Database.
In the following sections, we describe the design policy and provide
an overview of each of the four DBs.

2. OVERVIEW OF THE RWC MUSICDATABASE
We had to address various design, trade-off, and copyright issues inbuilding the RWC Music Database. In this section, we discuss someof the most important issues.
• Contents of the database (DB)An ideal music DB would contain many richly varied musicalpieces, in various genres, of the highest quality possible. For
practical purposes, though, we had to build our DB under production resource constraints such as our budget and available time.
We therefore took up three major music genres — popular, classical, and jazz — and tried to include as many realistic pieces as
possible in a way that reflected the complexity and diversity ofreal-world music. For example, as well as ensuring that variousstyles, moods, tempi, and lengths were represented, we also included as many professional composers, lyric writers, arrangers,singers, and players as our resources allowed.
To achieve sound quality as high as that of commercially distributed compact discs, we used professional digital equipment
for all recording, mixdown, and mastering processes.
• Copyrights of musical pieces
To make our DB available to researchers around the world, we
had to obtain all necessary copyrights and neighboring rights
for research purposes.1 We therefore included 215 pieces (forthe four DBs) that were all originally performed and recorded
for the purpose of inclusion in the DB. For the Popular Music
Database, we included 100 pieces that were originally composed
and arranged in modern popular music styles (the lyrics werealso originally written). For the Royalty-Free Music Database,
we included 15 public-domain traditional popular-music pieces
that were originally arranged for this DB. For the Classical Music Database, we selected 50 well-known public-domain pieces.
1 Note that our DB is not copyright-free even if it is available for free:
we reserve all necessary copyrights and neighboring rights. All users of theDB must submit the user agreement form to the general manager of the RWCMusic Database (Masataka Goto, contact: m.goto@aist.go.jp).

Proceedings of the 3rd International Conference on Music Information Retrieval (ISMIR 2002), pp.287-288, October 2002.

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RWC Music Database: Popular, Classical, and Jazz Music Databases
Table 1. List of music compact discs for distribution (Popular, Royalty-Free, Classical, and Jazz Music Databases).
Contents (Version)
Popular Music Database (Original Version: Mixed)
Royalty-Free Music Database (Original Version: Mixed)
Classical Music Database (Original Version: Mixed)
Jazz Music Database (Original Version: Mixed)# of discs
7164

Catalog number
RWC-MDB-P-2001-M01 − M07
RWC-MDB-R-2001-M01
RWC-MDB-C-2001-M01 − M06
RWC-MDB-J-2001-M01 − M04# of pieces
100155050

Piece number
No. 1 − 100
No. 1 − 15
No. 1 − 50
No. 1 − 50

Catalog number: RWC-MDB-[Contents]-[Year]-[Version][Volume No.], Contents: the first letter, Year: Made in 2001, Version: Mixed

2.4 Jazz Music Database

For the Jazz Music Database, we included 50 pieces where fourwell-known public-domain pieces were originally arranged andthe other 46 pieces were originally composed and arranged.
• Standard MIDI files (SMFs)
We prepared transcribed SMFs for all 215 pieces. These werestored in SMF format 1 (multiple tracks) and conform to the GSformat. Given audio signals, most of them were transcribed byear. For music genres such as popular and jazz where there are
typically no detailed scores, these SMFs can be used as effective
substitutes for scores. Even for classical music with scores, SMFs
that can be freely used for research purposes are valuable. Thelyrics of songs are provided as text files.
We used music compact discs (CD-DA: Compact Disc - DigitalAudio) as the medium for distributing the audio signals of the DBpieces to researchers. The list of the compact discs and their catalog numbers are shown in Table 1. Each piece has a unique “piecenumber” numbered in consecutive order from 1 within each DB.
The volume number (the last two digits of the catalog number) isused only for putting pieces onto the compact discs and should not
be used for reference: a piece should be referred to by the piece
number for research use (e.g., RWC-MDB-P-2001 No. 28).

The Jazz Music Database consists of 50 pieces:• Instrumentation variations: 35 (5 pieces × 7 instrumentations)• Style variations: 9• Fusion (crossover): 6
All 50 pieces were originally produced for our DB, except for thecomposition and lyric writing of four style-variation pieces. First,
the instrumentation-variation pieces were recorded to obtain different arrangements of the same piece: five standard-style jazz pieces
were originally composed and then performed in modern-jazz styleusing seven instrumentations: 1) piano solo, 2) guitar solo, 3) duo(vibraphone + piano, flute + piano, or piano + bass), 4) piano trio, 5)
piano trio + trumpet or tenor saxophone, 6) octet (piano trio + guitar+ alto saxophone + baritone saxophone + two tenor saxophones),
and 7) piano trio + vibraphone or flute. Second, the style-variation
pieces were recorded to represent various styles of jazz. The ninepieces, which include four well-known public-domain pieces, consist of vocal jazz (two), big band jazz (two), modal jazz (two), funky
jazz (two), and free jazz (one) pieces. Finally, the fusion pieces wererecorded to obtain music that combines elements of jazz with otherstyles such as popular, rock, or latin. All the pieces were recordedby 53 people, including four composers and one lyric writer.

2.1 Popular Music Database

3. CONCLUSION

The Popular Music Database consists of 100 songs — 20 songs
with English lyrics performed in the style of popular music typicalof songs on the American hit charts in the 1980s, and 80 songs withJapanese lyrics performed in the style of modern Japanese popular
music typical of songs on the Japanese hit charts in the 1990s. All
100 songs with vocals were originally produced in as rich a variety
as our resources allowed. The songs were recorded by 148 people including 25 composers, 30 lyric writers, 23 arrangers, and 34
singers. As a result of our attempts to achieve a good male-femalebalance in the 100 songs and to include songs by vocal groups, there
are 50 songs by 15 male singers, 44 songs by 13 female singers, and6 songs by 6 vocal groups.

The building and sharing of commonly available databases (DBs)will clearly make an important contribution to the research into musical information processing. With the four DBs that compose theRWC Music Database, researchers can now use copyright-cleared
musical pieces for each stage of problem finding, problem solution,implementation, evaluation, and presentation.
The RWC Music Database was built in fiscal 2000 and 2001
by the RWC Music Database Sub-Working Group (chair: MasatakaGoto) in the Real World Computing Partnership (RWCP) funded by
the Ministry of Economy, Trade and Industry of Japan [1, 2]. While
our DB was built for general purposes related to musical information processing and was designed independently of the ISMIR 2001
resolution (on the need to create standardized MIR test collections),
it is consistent with the resolution and can provide useful test setsfor various forms of music-related research.
We plan to make our DB available for researchers around theworld. In the future, it will be necessary to add various annotations
to the DB pieces in cooperation with other researchers. We hopethat our DB will be widely used worldwide, and that various otherDBs will follow, thus expediting progress in this field of research.

2.2 Royalty-Free Music Database
The Royalty-Free Music Database consists of 15 songs, 10 wellknown standard popular songs with English lyrics and 5 well-known
children’s songs with Japanese lyrics. All 15 public-domain songs
were originally arranged and recorded. This DB was built to contain well-known popular songs, while the Popular Music Database
contains only original popular songs. The songs were recorded by
16 people, including two arrangers and three singers.

2.3 Classical Music Database
The Classical Music Database consists of 50 pieces:• Symphony: 4• Concerto: 2• Orchestral: 4• Chamber: 10• Solo: 24• Vocal: 6
All 50 public-domain pieces were originally recorded for our DB(not all movements were recorded: a certain movement was selected and recorded for several categories such as symphony andconcerto). These pieces were selected to represent a rich variety
of instrumentation, style, period, composer, and mood. We did notintend to produce a mere anthology of well-known musical pieces:
we tried to include pieces that have been previously used in researchor have interesting aspects from a research viewpoint. The pieces
were recorded by 115 people including a philharmonic orchestra (72players with 1 conductor), 16 pianists, and 4 violinists.

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4. ACKNOWLEDGMENTS
We thank everyone who has made this DB project possible. Yuzuru
Hiraga and Keiji Hirata devotedly assisted us in designing the Classical and Jazz Music Databases, respectively. Satoru Hayamizu,
Hideki Asoh, and Katunobu Itou advised us concerning the development and distribution of the DB. This project has also been supported by many parties involved in the RWC project. The C MUSIC
Corporation carried out the production of all the pieces.

5. REFERENCES[1] M. Goto et al., “RWC Music Database: Popular music database androyalty-free music database (in Japanese),” IPSJ SIG Notes 2001-MUS42-6, vol. 2001, no. 103, pp. 35–42, 2001.
[2] M. Goto et al., “RWC Music Database: Classical music database andjazz music database (in Japanese),” IPSJ SIG Notes 2002-MUS-44-5,
vol. 2002, no. 14, pp. 25–32, 2002.