A look at Nirvana and their trajectory since the passing of Kurt Cobain, from legal issues surrounding the band's output to their frequent reunion concerts.

How could a central figure like Kurt Cobain ever be replaced ... Sonic Youth band members Thurston Moore and Kim Gordon even helped the band get signed to Geffen Records for 1991's Nevermind.

Congratulations are in order for Frances Bean Cobain and her husband ... including R.E.M.'s Michael Stipe, Sonic Youth's Kim ...

Four different women sang for the band during each song in place of the late Kurt Cobain. 'Breed' was fronted by St Vincent, 'School' was led by Kim Gordon and Joan Jett sang 'Territorial P*****s'.