Golden Sun has one of the most interesting soundfonts for GBA games – most of an orchestra is packed in, and the compression doesn’t seem to affect the output as much as other games.
I’ve been playing around recently with the soundfont, applying it to tracks from Pokémon and Zelda. Here’s Lavender Town in the style of the Elemental Stars theme:
Some other tracks
Link’s Awakening: Tal Tal Heights (in style of Walking Foward with Determination)
Link’s Awakening: Ballad of the Windfish
Link’s Awakening: Welcome to Koholint Island
Pokémon GSC: Tin Tower
Pokémon GSC: Ice Path