I remember hearing an orchestra playing instrumental music. The beat was fast, (well, I guess 120 bpm or more). The notes were plenty and mixed. In my imagination as a kid, I would call it "jungle music", because of all the "messy" notes which combined together sounded interesting.

In the example I remember, orchestra was small (6-7 people), with instruments including guitar, piano, drums, trumps etc.

It was not classical. It was a bit like Swing music. But it's faster than Big Band Swing. Also the whole song was full of notes, no pauses, no calming down, all the 5-6-7 instruments together.

The closest one would be Tom Waits Instrumental. But it's crazier. The dirigent of the small orchestra would make weird and random movements of the body while enjoying the performance. Maybe there are also some Hawaiian nuances to it.

Maybe I'm not looking for a genre, but just for a specific song. I don't know.