Nirvana bootleg recordings was created in 1988.
Bootleg recordings are illegal recordings, so yes it is illegal.
While it is illegal to buy, sell or distribute bootleg recordings, it is not illegal to own them, for collecting purposes.
"Bootleg" in music refers to unauthorized recordings or performances that are distributed without the permission of the artist or copyright holder.
Bootleg Detroit was created in 1994.
Bootleg - song - was created in 1969.
Bootleg Retrospective was created in 1977.
Ghetto Bootleg was created in 2005.
Bootleg -Feedbacker- was created on 2005-01-21.
Bootleg Versions was created on 1996-11-26.
Official Bootleg CD was created in 2004.
Bootleg - Tempest album - was created in 1991.
Rude Bootleg was created on 1986-08-24.