User blog comment:PacmanIsGr8DontH8M8/SSF2 Mod - Music Suggestions/@comment-25275196-20170708021605

Mushroom Kingdom II:

NSMBW Desert Theme.

NSMBW Airship theme.

Peach's Castle:

Pi'llo Castle theme.

Dreamy Pi'llo Castle theme.

Bowser's Castle:

SMW Castle theme.

M&L:DT Neo Bowser Castle theme.

Temple:

LoZ Dungeon theme.

LoZ Level 9 theme.

Phendrana Drifts:

Phendrana Drifts (duh)

I haven't played Metroid in a while, so I can't remember most other non-area themes.

Bionis Leg (what the simpletons call Gaur Plain, despite that name being very wrong):

Vision Reacts

Colony 9