Add a "original studio album" kind of tag

[kevinfrei]

I have a fair bit of weird one off music from artists I really like. Sometimes I want to hear it all, but sometimes I'd just like to hear the actual albums the artist recorded in a studio (and not duplicates of those same songs on a gazillion "best of" or "hits from 19-dickety-two" collections). This is both a metadata thing, and some UI to support filtering of both playback and transcoding (I typically want to transcode for my phone, and don't want dupes & live recordings)