I don't claim to know that much about MP3s or other formats, but I did run into this website awhile back that uses MP3 and FLAC formats for the Brandenburg Concertos. There's a huge diffence in sound and, of course, file size. (You'll have to scroll down.)
Flac works great~!
I can hear, in #7 in E major were Ian Anderson picked up a bit of inspiration for “Bouree”