Agreed, it gets confusing when talking to people who refer to musicals as plays...at least in my mind, that automatically means no singing present. The recommendation thing has happened to me, too, where someone asks for a play recommendation and then they'll start listing musicals.
I think the cast recording/soundtrack thing is way more irksome, though...
"Maybe Philly'll change your luck."-42nd Street
"Don't be afraid it won't be perfect. The only thing to be afraid of really is that it won't be."-Company