The house music club scene in cities such as Birmingham, Leeds, Sheffield, Wolverhampton and London were provided with dance tracks by many underground Pirate Radio stations. Club DJs also brought in new house styles, which helped bolster this music genre. The earliest UK house and techno record labels such as Warp Records and Network Records (otherwise known as Kool Kat records) helped introduce American and later Italian dance music to Britain. These labels also promoted UK dance music acts. By the end of the 1980s, UK DJs Jenö, Thomas, Markie and Garth moved to San Francisco, and called their group the Wicked Crew. The Wicked Crew's dance sound transmitted UK styles to the US, which helped to trigger the birth of the US west coast's rave scene. House was also being developed by DJs and record producers in the booming dance club scene in Ibiza. While no house artists or labels came from this tiny island at the time, mixing experiments and innovations done by Ibiza DJs helped to influence the house style. By the mid-1980s a distinct Balearic mix of house was discernible. Several influential clubs in Ibiza, such as Amnesia, with DJ Alfredo at the decks, were playing a mix of rock, pop, disco and house. These clubs, fuelled by their distinctive sound and copious consumption of the club drug Ecstasy (MDMA), began to influence the British scene. By late 1987, DJs such as Trevor Fung, Paul Oakenfold and Danny Rampling were bringing the Ibiza sound to key UK clubs such as the Haçienda in Manchester. Ibiza influences also spread to DJs working London clubs such as Shoom in Southwark, Heaven, Future and Spectrum. In the U.S., house music developed into more sophisticated sound, moving beyond the rudimentary drum machine loops and short samples that had characterized early US house. In Chicago, Marshall Jefferson formed the house group Ten City with Byron Burke, Byron Stingily and Herb Lawson (from "Intensity"). New York City–based performers such as Mateo & Matos and Blaze had slickly produced disco-infused house tracks. In Detroit a proto-techno music sound began to emerge with the DJ recordings and mixes of Juan Atkins, Derrick May and Kevin Saunderson. Atkins, a former member of Cybotron, released "No UFOs" as Model 500 in 1985, which became a regional hit. Atkins follow this by dozens of tracks on Transmat, Metroplex and Fragile. One of the most unusual songs was "Strings of Life" by Derrick May (under the name Rhythm Is Rhythm), a darker, more intellectual strain of house.