I know about the Sinatra channel. That's been my most listened to recently since the disappearance of old school hip hop. Might wear off though.
However, it is one of the very few channels that is NOT on the direcTV XM lineup. I dont know how. I would think it would be popular.
When I mentioned the possibility of it to my grandma she was like "ehhh I dont like him that much anyway". Go figure