Nirvana are a cult phenomenon who made it big, outselling giants Madonna and Guns 'n' Roses and grabbing the limelight in the process. Their debut album, Bleach, was produced for $600 and sold two million copies despite no mainstream radio play. Signing to major-league Geffen brought world domination and nine million sales with the release of follow-up album Nevermind in 1991. Now everyone wants to know about Nirvana, with critical acclaim being matched by unprecedented media clamour.