MiniGBS is a small .gbs file (gameboy music) player with an ncurses UI. It's not cycle-accurate, but still sounds good for most of the files I've tested.
n/→ Next song
p/← Prev song
r/↑ Restart song
space/↓ Pause/Resume
-/= Volume down/up
1/2/3/4 Toggle channel
esc/q Quit
Asterix & Obelix - *Alberto Jose González*
Mole Mania - *Taro Bando*
Pokemon Crystal - *Junichi Masuda, Gō Ichinose*
Pokemon Red - *Junichi Masuda*
Shantae - *Jake Kaufman*
Street Fighter II - *Yoko Shimomura, Isao Abe*
The Smurfs' Nightmare - *Alberto Jose González*
Turok: Battle of the Bionosaurs - *Alberto Jose González*
Zelda Oracle of Ages/Seasons - *Kiyohiro Sada, Minako Adachi*