Ok, here's a rundown about being in the show:
If you're a lead, then I suppose it would be a lot of fun. There's a lot of good music. If you're ensemble, not so much fun anymore. Or at least for me when I did it. There are a lot of ballads, lots of sitting time, at least in Act II. For the women there are five numbers, maybe more depending on how your director decides to do it. For the men there are six numbers, once again, it can change depending on how your director decides to do the show. The dancing in the show can be anywhere from very little to tons. During the song Come To Me, there is a dance break. It's a wonderful opportunity to add in a little ballet. It all depends. If you're a guy and you do the show, you may have a chance to do the sword dance which happens at the end of the wedding scene. It's amazing! Also, when Tommy and Jeff head back to New York and Tommy meets his gal in the club, there's a chance to do some swing or other form of swing dancing. Also a word of caution, this show is up in the rafters! I was an alto for this show and I was past my mezzo range. If you are a soprano then this is the show for you!
Hope this helped you!