Nirvana - Incesticide

Nirvana's Incesticide is a 1992 compilation of rarities and previously unreleased songs - reissued in 2017.

According to Discogs, previously unreleased songs - "Hairspray Queen", "Aero Zeppelin", and "Big Long Now" were officially unreleased at the time, as well as the versions of "Been a Son", "Aneurysm", and "(New Wave) Polly", which are different from the versions previously released on the Blew EP, the Smells Like Teen Spirit single, and the Nevermind record, respectively.

Previously released songs
"Dive" and "Sliver" were released on the Sliver single in 1990. "Dive" was also previously released on The Grunge Years compilation album in 1991.
"Stain" was released on the Blew EP in 1989.
The three cover songs, "Turnaround" (Devo), "Molly's Lips" and "Son of a Gun" (The Vaselines) were released on the Hormoaning (Exclusive Australian '92 Tour EP) in 1992, which was only released in Japan and Australia.
"Mexican Seafood" appeared on the 1989 Teriyaki Asthma Vols. I-V compilation.
"Beeswax" appeared on the 1991 Kill Rock Stars compilation album.
"Downer" appears on the CD version of Nirvana's 1989 debut album Bleach.