So, if they want to play a concert Bb scale, they start on a C (they have to think up a whole step). Concert C is their D, Concert Ab is their Bb. Alto and baritone saxes, alto clarinet and most alto horns are Eb instruments: when they play a C it sounds like a Eb on the piano.
In addition to his feature film credits, Diaz is well-known for his many seasons on Showtime's award-winning series Weeds, where he plays the role of Guillermo, as well as his comedic performances on Chappelle's Show for Comedy Central.
He was in the Disney film, after all. Granted, Gaston in Disney's Beauty and the Beast was a handsome, vain and occasionally dangerous joke. But still a joke. Considering the casting of this part on Once Upon a Time, we may get a wee bit of humor when Gaston makes his appearance. E! Online has reported that Sage Brocklebank (best known to TV viewers as officer Buzz McNab on Psych) will play Gaston in episode 12 of Once Upon a Time.