This is what my kids are into at the moment. We all love Horrible Histories, and this is the song of the day.
Horrible Histories is now a BBC Proms show playing at The Albert Hall. It won a British Comedy Award for best sketch show, competing against adult comedy. My daughter, Clancy, only got into reading for herself when I bought her some Horrible History books, and we love the tv series. My kids are singing the songs. A lot.
The other thing they're into at the moment is Big Babies. You can have a look here.
When they're saying things I don't understand, it's either from Horrible Histories or Big Babies.