QUOTE(Wikipedia)

Probot was a heavy metal side project of ex-Nirvana drummer and Foo Fighters lead-singer Dave Grohl. An album was recorded out of the material and released in February 2004.

...

On the album, Grohl teamed up with heavy metal vocalists from 1980s and 1990s bands who influenced his musical tastes while he was growing up. Similar to 1995's Foo Fighters, Grohl wrote all of the music and performed most of the instrumentation. Each track on the album features a different lead singer including Lemmy, Max Cavalera and King Diamond.

I got the Probot CD today! =D

I'm listening to it right now.

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