Replaces all in-game music with select tracks from Heroes of Might and Magic I-IV, excluding music disks 5 and 11, as I couldn't think of a suitable match. The resource pack can be used for Might and Magic-inspired maps/servers, but you may also find it useful for general medieval fantasy maps/servers.
I tried to pick the tracks according to the terrain type (swamp terrain music for swamp biomes, water terrain music for underwater) or the tone, but there may be some inconsistencies. The full track list is available in the .zip file.
This resource pack was made for 1.21, but should also be compatible with older versions up until 1.7.2, as it includes duplicate tracks for pre-1.20.3 file names. Be aware of possible audio doubling on older versions (this is a Minecraft bug)

Resource pack which replaces the in-game music with tracks from Heroes of Might and Magic I-IV