Phuture's seminal "Acid Tracks" is considered to be the first acid house record and credited for inventing and defining the genre.[1][2] The 12-minute instrumental composition was released on Trax Records in 1987. Originally, it was recorded to tape and played by DJ Ron Hardy at the Chicago nightclub Music Box,[3] supposedly already in 1985.[4] Its characteristic "acid" sound was derived from utilizing the Roland TB-303 bass synthesizer in a very particular way, using tone sequences modulated in real-time to produce a certain resonant and squelchy sound which is since then associated with the genre. The track also utilized Roland TR-707 and Roland TR-727 drum machines.
After "Acid Tracks", Phuture released a number of acid house and Chicago house tracks now considered classics of the genre, usually as 12-inch vinylmaxi singles. Their sound is gloomy and monotonous in nature; many tracks are very long, at times passing the 10-minute mark. The sparse lyrics occasionally reference drug use, such as the lyrics of "Your Only Friend" (1987), which describe cocaineaddiction, or a simple chant, such as on "Spirit" (1994). The group has recorded under several pseudonyms, generally using the substitution of ph or pf for f, as, for example, in Phortune or Pfortune.