F-Zero Climax introduced its own Port Town theme, but it also brought back the one from GP Legend for use in the Platinum Cup, and its out-of-tune bass issue was retained.
This hack fixes it, though the new Port Town theme probably makes it less relevant.
Database match: F-Zero - Climax (Japan)
Database: No-Intro: Game Boy Advance (v. 20210227-023848)
File/ROM SHA-1: 6EB9208C493E8BAA43ECC0DACF71A8CB631BE7CA
File/ROM CRC32: DBDC71E3