This hack replaces the original fighting music with an alternative, 90% similar with one that was not used in the game. Works with translation patchs too...
Database match: Nightshade (USA)
Database: No-Intro: Nintendo Entertainment System (v. 20180803-121122)
File SHA-1: 75DB8D9678DCCB0F1341DF03D9C35A80D567558F
File CRC32: C6D266AF
ROM SHA-1: 0A6BF1E319A9EE7B5B7EF3C3BA20A04C57BD8C89
ROM CRC32: A60CA3D6