Longships is a game music pack for a Norse saga. All 44 tracks are written from one family of five themes, and a check reads the finished MIDI back and counts 1,084 statements of them, so the record holds together as one score.

Every track stands on a tonic drone, the way a hurdy gurdy or a hardingfele holds a note under a folk tune. It is its own track in every MIDI file, so you can mute it.
Title and world map themes, sea and coast, towns, a great hall, battles up to a final battle, and an ending. 52 minutes. OGG with loop tags for RPG Maker MV and MZ, plus every editable .mid. $14.99.
https://csaf.itch.io/longships
Disclosure: the composition code is AI written. No generative audio model is used.