i think i know something that will make music sound a bit better Drums And Cymbols because listen to some things some of them need some clashing and banging and drums are just pure epic
Dude, there are already drums...
no your getting all

with this i mean like it should be in more then just percussion low drums high drums like that sorry for the confusion :-/
I used the standard MIDI percussion instruments because it makes importing and exporting MIDI files a lot simpler. You can get different percussion sounds by playing different drum sounds at the same time.
Have you ever considered adding instruments like Glockenspeils? (A.K.A. Mallets instruments)