disputed nirvana box set on sale a box set featuring 68 unreleased nirvana tracks has gone on sale in the us  after years of legal wrangles.  with the lights out was intended to be released in 2001  to mark the 10th anniversary of the album nevermind. it was blocked by courtney love  the widow of nirvana frontman kurt cobain  who did not want unreleased song you know you re right on the box set. the dispute between love and surviving band members krist novoselic and drummer dave grohl was settled in 2002. work began on the box set in 1998  but legal battles put the project on hold. the legal fight centred on a studio recording of the unreleased track you know you re right  regarded by fans as one of the unreleased gems of nirvana. the set  released on tuesday  features three cds and a dvd of rare performance and rehearsal footage. the dvd also includes the first performance of smells like teen spirit  the track that launched nirvana on to the international stage in 1991.  the band wasn t always pretty  or always in tune. this is not nirvana unplugged. it s nirvana unedited   said cobain biographer charles cross. the band s development ended tragically when songwriter kurt cobain committed suicide in april 1994.