Just clarifying, because I eventually took the bass as my second instrument and it's rather challenging to get the correct notes if you don't develop the 'ear' for it...
Haha, something like that... I just watched the trailer.
Not only does it have the aforementioned Wolverine and Catwoman, but it also has the actor who was Bellatrix Lestrange in Harry Potter. Definitely going to watch it now.
I also play guitar (and bass by association) and recently got a harmonica and am attempting to learn that.
Bass guitar right? ...because the bass is a completely different monster if you want to try and play it after having played guitar.
Also, I'm a pianist. I've been one for about 8 years or so and am decent. Also, at the violinist who wants to read other clefs, you learn all about the clefs if you do grade 5 theory. (or higher) They require you to transpose and whatnot.
As for the tuba, I actually played a bit of tuba (briefly) when I was browsing for a second instrument I could take, as my music scholarship covers lessons for up to two instruments and it'd be a waste to not do two. (although, I really don't practice anything other than piano)