Question: Samfree is a Japanese music producer that using what software to produce his music?

Context paragraphs:
Vocaloid: Vocaloid (ボーカロイド , Bōkaroido ) is a singing voice synthesizer.  Its signal processing part was developed through a joint research project led by Kenmochi Hideki at the Pompeu Fabra University in Barcelona, Spain, in 2000 (the same team that later founded Voctro Labs) and originally was not intended to be a full commercial project.  Backed by the Yamaha Corporation, it developed the software into the commercial product "Vocaloid".

Noriyuki Asakura: Noriyuki Asakura (朝倉 紀行 (formerly 浅倉 紀幸) , Asakura Noriyuki ) is a Japanese music composer and vocalist.  He is famous for composing the soundtracks to the anime series "Rurouni Kenshin" and the popular video game franchises "Tenchu" and "Way of the Samurai".  He is well known for combining traditional Japanese music with elements of rock, jazz, and other world music.

Japanese musical scales: A variety of musical scales are used in traditional Japanese music.  While a twelve-tone (dodecaphonic) Chinese scale has influenced Japanese music since the Heian period, in practice Japanese traditional music is often based on pentatonic (five tone) or heptatonic (seven tone) scales.  In some instances, harmonic minor, like in the famous piece Sakura Sakura, is used, while the melodic minor is virtually unused.

Tomotaka Imamichi: Tomotaka Imamichi (イマミチ・トモタカ , Imamichi Tomotaka , kanji: 今道友隆, aka Imasa) , (born October 12, 1959) is a Japanese music producer, guitarist and songwriter from Tokyo, Japan.  He first got his huge break in the Japanese music circuit in 1984 as the guitarist and primary songwriter for the rock band, Barbee Boys, although it is reported that he has been writing music himself since at least 1975 after being highly influenced by Toshikatsu Utsumi from the legendary folk band Carol.

Nik Weston: Nik Weston is a DJ, music producer, record label owner of Mukatsuku Records and music buyer for Juno Records.  Based out of London, UK, he was from the late 1990s to 2007 a key player in the promotion and distribution of Japanese recording artists and their releases outside of the country, as part of the late 1990s into 2000s revival in the jazz dance, soul-jazz and electronic Japanese music scene.  He is a keen advocate of the vinyl record format.

William P. Malm: William Malm (b. March 6, 1928) is an American musicologist known for his studies of Japanese traditional music.  As a composer, teacher, and scholar of Japanese music, Malm shaped the study of ethnomusicology in the United States.  Malm authored the first major scholarly study on the history and instruments of Japanese music, "Japanese Music and Musical Instruments" (1959).  He was a faculty member at the University of Michigan from 1960 to 1994.  Malm served as President of the Society for Ethnomusicology from 1977 to 1979 and was named an Honorary Member of that organization in 2004.  Malm was awarded the Fumio Koizumi Prize in 1992 for his contributions to the study of Japanese music.  As the 2001 Charles Seeger Lecturer, Malm's address focused on the history and founding of ethnomusicology in the United States.

Enka: Enka (演歌 ) is a popular Japanese music genre considered to resemble traditional Japanese music stylistically.  Modern enka, however, is a relatively recent musical form, while adopting a more traditional musical style in its vocalism than "ryūkōka" music, popular during the prewar years.

Samfree: Sano Takayuki (佐野貴幸 ) , more commonly known as samfree or SAM, was a Japanese music producer heavily involved in composing and arranging songs using Vocaloid software.  He was also notably involved in producing theme songs for various anime television series.

Netlabels in Japan: Since the mid-2000s, a counterculture has taken place where numerous netlabels, online labels that release their music for free, located in Japan have been formed and garnered a huge amount of publicity which, according to writer Patrick St. Michel, has shaped how popular Japanese music is produced.  Japan's netlabel phenomenon was the first time in the history of the nation's music industry where underground musicians could produce their works however they wanted to and have their music noticed by the public; this is an aspect that was previously absent at a time when major labels in the country followed a conservative method where they managed how artists would produce their music.  Starting in the 2010s, the netlabel scene has crossed over to the mainstream music landscape and all across the world, with netlabel producers transitioning into working for bigger labels and western producers like Cashmere Cat and Ryan Hemsworth being influenced by the music of Japanese netlabels.

J-pop: J-pop (often stylized as J-POP; Japanese: ジェイポップ "jeipoppu"; an abbreviation for Japanese pop), natively also known simply as pops, is a musical genre that entered the musical mainstream of Japan in the 1990s.  Modern J-pop has its roots in traditional Japanese music, but significantly in 1960s pop and rock music, such as The Beatles and The Beach Boys, which led to Japanese rock bands such as Happy End fusing rock with Japanese music in the early 1970s.  J-pop was further defined by new wave groups in the late 1970s, particularly electronic synth-pop band Yellow Magic Orchestra and pop rock band Southern All Stars.

Supporting paragraphs: Samfree Vocaloid
Answer: Vocaloid