Input (grade 6): Kurt Donald Cobain (February 20, 1967 - c. April 5, 1994) was an American musician, best known as the lead singer, guitarist and songwriter of grunge band Nirvana.
Output (grade 12): Kurt Donald Cobain (February 20, 1967 - April 5, 1994) was the lead singer and guitarist of the grunge band Nirvana, which also included bassist Krist Novoselic and drummer Dave Grohl.