I use the simple search and I think that I find all the CDs of the composer I'm looking for. The automatic scan details are so different for different CDs that I have to correct quite a lot. I looked now at Beethoven, In the simple search I found those where the composer is entered, and one CD where Beethoven appears as an artist (!) in a CD of Various composers, no composers listed in the tracks, they're all "artists".

I see that in the CDs with a single composer (most of mine) the tracks never have the composer's name, so if I would search by track I wouldn't find them.

I found one Bach CD on the shelf which wasn't on my Bach OCD list, though it was scanned. So there was some missing detail when I entered it, and I didn't notice it then.