Euph, my daughter is a percussionist and my son plays alto sax. The daughter, in the video, is playing marimba 1 along with another girl playing marimba 2. The 2 guys are playing the vibraphone and the xylophone and the composition is 'Metric Lips'.
KC
Edit to change tenor sax to alto sax. 
Wow, two marimbas on stage (still can't see the video). That's a lot of rosewood! Never heard of the piece, but that's not unusual. I note from a quick Google that it's a Bela Fleck (of the Flecktones) chart and the whole thing is a percussion ensemble piece.
It's so difficult to find good all-round percussionists. Most are good on one type of instrument or another, whether mallets, drum set, rudimental drumming, timpani, etc. They can almost set their own wage scale, with cartage, so it ain't a bad gig (except schlepping all that stuff around all the time). THAT can get old...