Right now what is possible, though, is to link the members of a band (or orchestra...) to the group via the member of relationship.
Unfortunately, that doesn't let you specify who played on this recording, or that while Bob normally plays electric guitar, on this recording he played acoustic guitar.
But if you do both—put the people who played and the group on the recording and in addition make sure the member-of relationship is in the database, then that actually is clear: Bob and Tom play drums on this recording. So does the group The Hypothetical Band. Bob and Tom are members of the Hypothetical Band, so they're not additional people playing.
(If you just have Bob and Tom, without the band, you don't know which of two bands they're in, or if maybe this is something that they did without the other band members).
[But please don't do this with orchestras. I doubt the page would even load once you'd added 60+ people to each recording].