Hey, Scots-Irish is an ethnicity!

It doesn't matter what's on the business cards, they will run out soon enough if he's busy promoting himself. I agree that "world" is a better word for him than "ethnic". I also think just plain "percussionist" is adequate, because a session percussionist is generally expected to be able to play congas, frame drums, dumbeks, etc. The fact that he's getting a degree in "ethnopercussion" means to me that when he actually gets the degree, that's what it should say as a following line of information:
Kevin Katich
Drummer and Percussionist
BA in Ethnopercussion
The site looks quite solid and easy-to-use otherwise, good work. The only minor criticism I'd have is that the non-gallery pages are kind of dull, they could use a little "zazz" in there. A little splash of bright color or asymmetrical stripes, something like that.