I tried searching myself... I can't find it! So I came here to see if anyone can find or might know what it's called.
Lately my friend and I had been watching "One Piece" and while I was watching I got interested in a couple of midi songs during the episodes. I don't know what they're called and when I try searching for them I find a dead-end...

One is like a piano theme where it sounds like a celebration of some sort but no singing! And the other is like a song that plays when there is like some powerful enemy like mihawk emerging.. I don't know if these details help but it's worth to try and ask. =)