In "Pam's Replacement" episode of "The Office" which musicians played in James Spader's band?

Steve Moore was the drummer, he's in Rick K and the Allnighters: http://www.maddrummerinc.com/
He's a Youtube poster child:
http://www.youtube.com/watch?v=ItZyaOlrb7E

Linda Taylor was the guitarist, she was a regular on
"Whose Line is it Anyway" playing guitar:
http://www.youtube.com/watch?v=HDgYb2xllgw

Robin Swenson was on keyboards, he's a L.A. session player who's toured with The Four Seasons, Air Supply, Phil Settle, etc.
http://www.myspace.com/robinswenson

Also of course Kevin and the Zits: Kevin, Andy and Darryl.
I don't understand why Creed isn't part of the group, with his musical background.

That episode's credits:
http://www.youtube.com/watch?v=-DzptBELNbs