In the original game, the bass line in the Port Town theme is played in a different key than the other instruments, which makes the song sound really bad.
In this hack, it was raised by 4 semitones, so it now sounds as it should.
Database match: F-Zero - GP Legend (USA)
Database: No-Intro: Game Boy Advance (v. 20210227-023848)
File/ROM SHA-1: 977588D9D27B7115E0BB309FB019AE81B9F413FF
File/ROM CRC32: 781AAB58
Database match: F-Zero - GP Legend (Europe) (En,Fr,De,Es,It)
Database: No-Intro: Game Boy Advance (v. 20210227-023848)
File/ROM SHA-1: 1BFE5E96138CF0ED5D3D33BFEC215B734AD32D3A
File/ROM CRC32: F1D5601B
Database match: F-Zero - Falcon Densetsu (Japan)
Database: No-Intro: Game Boy Advance (v. 20210227-023848)
File/ROM SHA-1: 35F47A985873B3018D4BE05AB7B539DFE3BFF21A
File/ROM CRC32: 2446B920