What is it like? Are there vocal songs? Or just score?

There are many different Sweeney Todd CDs. You're probably talking about the soundtrack for the movie with Johnny Depp though. Said soundtrack features all the songs from the movie along with the instrumental opening title. The singing is meh. Check out the original Broadway cast album or the revival concert album for the complete musical and higher quality performances.

Also, I think you're posting in the wrong section unless there's a Sweeney Todd game I'm unaware of. That'd be kinda awesome.

Dangit, I was hoping it was mostly score...

^ i kind of share your thought... i wish there was a score OST and a song OST (the score with the voices added)

Someone should post the original Broadway cast soundtrack of Sweeny Todd-the movie is OK but the play is really great stuff-