What on earth is rubato?

There’s a particular TV theme that I’ve been wanting to play on the piano for ages. Today I managed to get hold of a copy of the music.

Three flats.

This is a bit of a pain. Every E, B and A that I play must be flattened. It never goes well when I attempt audience participation on this blog (I’ll refrain from mentioning the obvious reason for this). But anyhoo, anyone got an idea what the TV show is from the above?