Fixing tags for classical and compilations

Question

Hi. Does anyone know a way of tackling the following two tagging problems?
1) I'm finding that the tagging service that iTunes uses, Gracenote, to be pretty inconsistent when it comes to classical music.  In some cases, it makes the artist, the movement and the composition, the track name, as in:
Name: String Quartet No. 5, Sz 102
Artist: 1. Allegro
In another case, it has labelled the track names of several (but not all) disks it a box set gibberish, as in:
Name: &}4ÍOò ,7j Øw¿ \Á59-1  éºâÕ¹ü,1}à
Artist: Amadeus Quartet
Album: String Quartets Vol.4
Since I subscribe to Match, I've tried both downloading mislabelled songs that are available in the iTunes store and asking iTunes to "Get Track Names". But neither solution has helped. I've also tried MusicBrainz Picard. But that's also really not very good with classical music. Short of doing it manually, which would take forever; is there another way of addressing this?
2) I've had iTunes tag some of my compilations in my preferred format, which simplifies browsing my catalogue by artist. It looks like this:
Artist: Various Artists or VA [album name]
Album: [album name]
Name: [artist] / [song name]
A good number of them, however, are tagged as if they were a non-compilation albums, eg.:
Artist: [artist name]
Album: [album name]
Name: [song name]
This means that each compilation adds a dozen or so artists, with one song each. This makes it a pain to browse by artist, especially in an iOS. For this reason, I'd like to have all compilations conform to the first format. But again, I haven't come up with a way of altering the tags in mass.
Any tips to address either of these issues would be greatly appreciated. Thanks in advance.

Answer 1

Hi,
Thanks for the respose. I realize that I need to settle on a pattern that I like and adopt it. My question, though, is about how to adopt and implement it. When it comes to arist and composer you can go at least change them manually album my album. But changing by every single track in an album to adress the problems that I describe would take forever. The same issue arises with fixing the tagging pattern of compilations.
I would imagine that there should be a way of customizing the manner in which services like itunes/Gracenote popolate the fields. But I haven't yet found a service that a) has an adequate classical music database and b) allows that kind of flexibility. Mediamonkey says that it does (I haven't tried it); but it's Windows only.