It's the Campanile Orchestra, and it's quite a talented orchestra. Another option open to you (and I'm admittedly biased here, as I was the drum major last year...) is the Marching Owl Band. They're called the MOB, they dress like gangsters, you need absolutely no band experience to join, they play cool arrangements of modern music, it's a lot of fun and very low pressure, they've got an awesome director, and they have non-traditional instruments as well, like violin, bass guitar, keyboards, and even a cello. =)
Check it out:
http://mob.rice.edu/
Private message me if you've got any questions about the band, as I'd decidedly be able to answer them. It was really a blast.