Answer
Trailer-song and OST searches should be answered from official video or creator music sources when possible.
The trailer-song search is tied to Piggy: Intercity music/OST context; use official video descriptions, MiniToon media, and creator music sources before trusting reuploads.
Use official video descriptions, MiniToon media, and creator music sources before trusting reuploads.
If you want more music, open the OST page rather than searching only the trailer clip.