1. One of the most important bands in music history and became extreamly popular in 1991 with "Smells Like Teen Spirit" (the name comes from what Kurt thought was a rebellios term at the time, but however turned out to be his girl friend's deoderant).
Headed by Kurt Cobain, Nirvana Popularized the music sub genre of grunde and influenced many other bands. With 50 Million albums sold they are often cosidered to be the best grunge band of all time.
2.A perfect mental state of bliss in buddism.
The lead singer of Nirvana was in a state of Nirvana when Nirvana became popular.