Conversation so far:
Was the Max Weinberg 7 the house band from the first episode?
The show's house band was The Max Weinberg 7, led by drummer Max Weinberg, who also served as a sounding board for O'Brien on the show .
Were other bandleaders considered before Max Weinberg got the job?
CANNOTANSWER.
What notable comedy bits did Weinberg do?
"LaBamba" was also used as the butt of many of Conan's jokes.
Who is LaBamba?
These humorous sketches usually revolved around LaBamba's sizeable mustache, his poor acting skills, and his alleged inability to read written music.
What instrument does LaBamba play?
drummer.
Then where does Max Weinberg sit?
Richie "LaBamba" Rosenberg on trombone, Mike Merritt on bass, Jerry Vivino on saxophone and brother Jimmy Vivino on guitar.
What well-known musicians did members of the band play with?
James Wormworth served as backup drummer when Weinberg went on tour with Bruce Springsteen.

Question: Were any of the other 7 associated with well-known musical acts?
Self-contained rewrite: In addition to the Max Weinberg 7 band being the house band on Late Night with Conan O'Brien, were any of the other 7 members associated with well-known musical acts?