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^ I disagree with Copiously Credited Creator as I don't think that's the question being asked.
They're talking about someone like Jørn Lande
who has released over 10 albums under his self-named band, has officially been part of 9 other bands, and has been a guest for over 20 more. Not exactly low numbers for just one man.
Agree with Renaissance Man if they have a variety of skills, like playing multiple instruments across multiple bands or unrelated genres or something. (A musician who does metal and hard rock probably wouldn't count as a renaissance man.)
It doesn't really otherwise strike me as being tropeable though. Should there be another trope for actors who have had a lot of roles? What constitutes a lot, anyway? Just seems overly subjective and not really about a skill or behavior (Compare, say, Man of a Thousand Voices).
Edited by KD@KD Thanks for your input. I believe it could become a trope due to the fact that the character is everywhere (and sometimes when you look at an artist's gigantic resume, you wonder how they could have pulled out so much work in short periods of time). I think it builds character, something similar to a workaholic but without necessarily having to do their job.
Star light, star bright, First star I see tonightPossibly Sir Cameos-a-Lot, if they appear as a guest on far more albums than they've released themselves.

On top of their solo career, An artist is credited to a lot of albums or projects, whether they're a composer, a writer or producer. They're known for being present in various music circles and you can hardly find an artist that isn't related to them..