On Saturday (January 10), Foo Fighters played a special show at the Forum, in Los Angeles, CA, for Dave Grohl’s birthday. During the performance the band was joined by multiple special guests including: Lemmy Kilmister (Motörhead), Alice Cooper, Trombone Shorty, Joe Walsh (Eagles), Perry Farrell (Jane’s Addiction), Zakk Wylde (Black Label Society), Nick Oliveri, Slash…