I have a small dilemma as to what to do with the artist relationships for the recordings on the “Gold” compilation by The Moody Blues. The CD liner notes list the various people involved with each track, but not their instruments or vocal parts; Wikipedia does list the breakdowns ( Gold (The Moody Blues album) - Wikipedia.
Because the album is a compilation, many of the recordings come from the various albums in their discography, and adding relationships will have them appear selectively on the individual releases which makes things ugly and inconsistent. Further, the Wikipedia page is too broad (e.g., all four members are unlikely to be vocalists on all the songs) and so inaccurate.
In this case, is the preferential thing to a) leave out the relationships altogether; or, b) add the relationships at the release level, thus painting them in with a very broad brush?