Drake & Josh is absolutely Samuel TV.
As for Ozma getting paid, I wouldn't be surprised if they don't, sadly. A friend-of-mine's band had a song featured on a TV show... They weren't offered any money, just the privilege of having their music on TV--which, I don't mean sarcastically, as it is good publicity assuming it's publicized a bit more than barely-audible background music.
I remember I asked Kenn once about hearing an Ozma clip on some recently aired MTV show. Apparently, Ozma hadn't even been informed that their song was being used. It was as much a surprise to them as it was to me to hear it. I think MTV pretty much does whatever the fuck they want though, 'cause I'd think the last thing an "under-the-radar" band would want to do would be piss off MTV.