I liked Gaia, I loved the Cascade theme from the rapids stage tho when the raft got stuck over the waterfall and with the rainbow. And I liked the hot zone stage theme but DOA6 stage themes are best imo, the APO stage and Throw down and Coloseum and Muscle stage are god tier<3
Unforgettable's theme Virtue is actually my favorite theme across both DoA5 and DoA6. It's also my favorite stage in DoA6, music or no music. I really loved The Muscle's at first too, but now I just like it. New character-specific themes would be nice.
Ignition from the DOA5U trailer is actually my favorite track since DOA5 in general, but since it's not tied to any stage I adopted it as Tina's new theme, lol. It just suits her, imo.
Virtue (DOA6) is really nice as well.