There are several artists using the name "Cloud 9." 1. Cloud 9 is the alias used by drum and bass artist Nookie a.k.a. Gavin Cheung (Discography) 2. Cloud 9 is a hip-hop band from Long Island/Monroe.
3. Nujazz Project on Acid Jazz Records, they did one album in 1993 called 'Millenium', it was produced by Mark Brydon who later formed Moloko together with singer Róisín Murphy 4. There is also an Austrian artist performing under this name. Sounds a bit like Elliott Smith. 5. Cloud 9 is an A Capella group operating out of University of California, Santa Cruz.