TV theme: House

Theme in two senses: this is the second post on TV today, and I also wanted to comment on the theme music for House, Hugh Laurie's excellent show being broadcast on Five in the UK.

I'm already a bit grumbly because House series two - no longer House, M.D. - has stuck with a change of theme music rather similar to the change that temporarily cursed Law & Order: Criminal Intent back in its second season. But it seems there is more to this than meets the ear. According to the Wiki entry on the programme, the theme music in the US is actually the lovely Massive Attack tune "Teardrop":

The opening theme is "Teardrop" by Massive Attack, although due to rights and licensing issues this music is not used for the show in Australia, Great Britain, Italy, New Zealand and Latin America which instead use a piece of music named "House", written specifically for the show. "Teardrop" itself does have lyrics, however for the opening credits only the beginning section of the song is used, which contains no lyrics.

Well, I HAD spotted its similarity in the first season music, so maybe for THIS season, the UK music has to be more obviously different from the original Massive Attack song. I understand that rights and ownership issues can vary a lot, but I'm interested in why it changed more dramatically in this second season. Did we get the first season's US music snippets (actually from "Teardrop") and it's had to be altered?