Smile.dk (sometimes written SMiLE.dk or Smile-dk, pronounced "Smile D-K") is a Swedish bubblegum dance group with Veronica Almqvist as the only current member.
 The band is known for many songs featured in music video games such as "Dance Dance Revolution" and "In the Groove".
 These include "Butterfly", "Golden Sky", "Boys", "Mr. Wonderful", "Petit Love", "Koko Soko", "A Geisha's Dream" (with Naoki Maeda), and "Dancing All Alone".
 They have regularly appeared on the albums of the popular dance compilation "Dancemania" series since its tenth issue, including many of its sub-series such as "Dancemania Speed".
 Smile.dk has been one of the most featured bubblegum/Eurodance acts in the "Dancemania" series, along with the likes of Captain Jack and E-Rotic.
Dancemania Speed Best 2001 Hyper Nonstop Megamix, or simply Dancemania Speed Best 2001, is a greatest hits compilation album of "Dancemania"'s "Speed" series, released by EMI Music Japan in 2000.
 The album features selections chosen from previously released five "Speed" albums, mostly from the earlier four issues which reached number 1 on the Oricon Foreign-music Chart respectively.
Dancemania Speed Presents Happy Ravers is a compilation album of "Dancemania"'s "Speed" series, released by EMI Music Japan in the early 2001.
 With the leading mixer DJ Evil, the album features fast-paced techno and happy hardcore music.
Rave 92 is a DJ mixed compilation album compiled by Mark Arthurworrey and released on Cookie Jar Records, containing popular rave singles that had become popular in the United Kingdom in 1992.
 The compilation, the fifth and final rave compilation compiled by Arthurworrey and released on the label, aims to collect some of the year's biggest rave hits, although, as has been pointed out, "Rave 92" also intends to "bridge across the gap between chart rave and the more obscure hardcore tracks."
 Released in November 1992, "Rave 92" was well-received and a commercial success, reaching number 3 on the UK Compilation Chart.
 Several latter-day electronic producers, including Phaeleh, have cited hearing "Rave 92" for the first time as the point they became interested in electronic music.
MC Magika, sometimes credited as M•A•G•I•K•A, is a British MC, music producer and rave promoter.
 He has been regularly featured on the UK breakbeat compilation "Dreamscape" series, and on the mega-hit dance music compilation "Dancemania"<nowiki>'</nowiki>s "Speed" sub-series.
 He is also well known for being the former MC for DJ Carl Cox.
Dancemania Speed Presents Trance Ravers is a compilation album of "Dancemania"'s "Speed" series, released by EMI Music Japan in the late 2001.
Happy hardcore, also known as happy rave or happycore, is a genre of hard dance typified by a very fast tempo (usually around 160–190 BPM), often coupled with solo vocals or sentimental lyrics.
 Its characteristically 4/4 beat "happy" sound distinguishes it from most other forms of hardcore, which tend to be "darker".
 It is typically in a major key.
 In its original incarnation, it was often characterized by piano riffs, synthetic stabs and spacey effects.
 This genre of music is closely related to the typically Dutch genre of gabber.
 Happy hardcore evolved from breakbeat hardcore around 1991–1993, as the original house music-based rave became faster and began to include breakbeats, evolving into oldschool jungle which evolved into drum and bass.
 Some of the most famous artists of this genre include DJ Brisk, Scott Brown, Darren Styles, Hixxy, DJ Paul Elstak, Anabolic Frolic, Dune, Scooter, Critical Mass, Stu Allan (a.k.a. VISA), Dougal, Slipmatt, DJ Sharkey, DJ Gammer, DJ Sharpnel, nanobii, and DJ S3RL.
Rave music may either refer to the late 1980s/early 1990s genres of house, breakbeat, acid house, techno and hardcore techno, which were the first genres of music to be played at rave parties, or to any other genre of electronic dance music (EDM) that may be played at a rave.
 The genre "rave", also known as hardcore by early ravers, first appeared amongst the UK "acid" movement during the late 1980s at warehouse parties and other underground venues, as well as on UK pirate radio stations.
 The genre would develop into oldschool hardcore, which lead onto newer forms of rave music such as drum and bass and 2-step, as well as other hardcore techno genres, such as gabber, hardstyle and happy hardcore.
 Rave music is usually presented in a DJ mix set, although live performances are not uncommon.
Dancemania Speed is a sub-series of Toshiba EMI's "Dancemania" compilation series.
 This series features faster, further remixed versions of recordings from previously released "Dancemania" albums or faster remixed covers of various famous songs.
 Unlike the main series mostly consisting of Eurodance, this series largely consists of hardcore techno crews from the UK, the home of happy hardcore, and some Eurobeat Italians who are very much experienced in high BPM dance music.
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Dancemania Speed Presents : Best of Hardcore, or simply Best of Hardcore, is a compilation album of "Dancemania"'s "Speed" sub-series, released by Toshiba EMI in the early 2003.

Question: What is the compilation album of the "Dancemania" in which happy rave music is one of the main features of the album?
Answer: Dancemania Speed Presents Happy Ravers