Tenacious D

Foo Fighters leader previously jammed with Geddy Lee and Alex Lifeson at Taylor Hawkins Tribute Concerts.

Trio of episodes showcased a heady and genuinely rocking mix of throwback pretension and actual musicianship.

All-star team-up was part of VictimsFirst benefit show thrown by Judd Apatow.

Jack Black and Kyle Gass' comedy rock group has performed dozens of classic tracks over the years.