what could i have a group of 10-year-olds do in music class?

i twerked it and the kids liked it

I don't think it would work, at least not on a practical level
All they'll want to do is play the fucking game

Probably, but they're kids, who have to listen to what teacher tells them (ideally)
But even then, the only question that needs answering is: What do these kids take away from these classes?

If you can give the ones who are already interested in music a bit of experience with an instrument they're interested in, that's great and a goal worth striving for.
However, the kids who don't really care about the instruments often times do care about the music; playing the game would be great for them, especially if it has memorable songs.
Showing them the connection between the instrument and a popular song, telling them they can play it for real with a bit of practice, can pique their interest.

I have lots of musically retarded people in my direct circle of acquaintance who shrug when I play some hardcore Andres Segovia that I'd been practicing for weeks, but when I play Für Elise on my nylon-string (even if it's the most basic version, following the right-hand melody) they think I'm some sort of musical prodigy. This isn't necessarily because they don't recognise something might be more difficult to play, but because it's of interest to them, in the case of Für Elise it's due to the recognisable melody by a great composer that's engraved in the musical collective mind.
Getting (ten-year-old) people interested in participating is going to be the biggest hurdle, and making it something they can relate to more easily (even by way of a game) will lower that threshold.

If playing the backing guitar to some Fergie song (popular/recognisable) in a game and on a real guitar is going to make the more musically retarded kids leave class with a "mind=blown" feeling, raising their interest, making them seek out musical ideas individually, then I don't see why it wouldn't be a good idea. Worst case scenario, they play the game and learn some rhythm (like Joe mentioned), realising they're not interested in making music themselves (yet).

Give them a lesson on the proper mic etiquette involved in battle rap then stage a freestyle competition.

i second the rhythm heaven fever suggestion

LOL @ thinking any video games aren't childish.

6/10

What a glorious day, OP! Your thread has been recorded as is now available in all file formats

http://vocaroo.com/i/s0aeyXILUS4g

Are you listening to Koz?

always

lol koz

LOOK AT ME I AM A WHITE PERSON AND I AM SAAAAD

shut the fuck up

It's so true, though. Koz is for sad white men, even if they don't know that they're sad. The only time I can stomach the level and types of emotions he uses is when I'm depressed.

he makes people laugh tho