Where is score X2 in Lego Star Wars The Complete Saga?

You're asking about the score X2 in Lego Star Wars: The Complete Saga. The game has many different music tracks, but there isn't a track specifically called "X2".

Could you be thinking of a different track, or perhaps a specific level or scene where the music seems to repeat?

If you can provide some more information, I may be able to help you pinpoint the music you're thinking of!