I could go on and on, but I will limit myself to one game.
I have to say that Dragon Spirit's chiptunes (not all of them are stellar, mind you. Some tunes are rather shrill on their own but complementary whilst playing).
Anyway...a few tracks from Dragon Spirit are the BEST out-of-game tunes to be found on the PCE, (IMHO) and really need to be listened to—surprise, surprise—outside of the game.
Why? Sadly, the sound effects for shooting and/or bombing (land targets) cancel out some of the the music channels whilst playing and it really, really, really is a shame.
I can find the names of the tracks I love...
UPDATE: folks, you can (1) download entire .rar or, if you'd rather not be bothered, just (2) listen to individual tracks in your browser...
http://archives.tg-16.com/music_database.htm?col=jp&val=dragSome favorite tracks of mine are:
10 Hyouga (normally I don't like upbeat tracks, but this one is fantastic, I love the segments with droning background synths)
04 Kazan (wait until the sweeping synth soars in at 00:30, and it just build and builds, getting better and better)
08 Sabaku
13 Yamata
02 Kodai (classic, but I've "over-listened" to it)
Short and (bitter)sweet tracks—wish they were longer:
05 Hinotori
07 Hanakumo
09 Doukutsu