Ok this is a long shot. Does anyone know the song, and it was used for a Levi ad I think (I know so many songs, and It wasn't flat eric), but it goes like "da da dahhh", with a girl singing it, and there's like i think it sounds like an electric guitar. I don't think it has any other lyrics. That's how i can only describe it, I'm sorry it's very vague. But i hope yu guys can help me!
I may be way off the mark here but I think I know the one you mean. I vaguely remember it was from the twisted jeans ad with a man and woman, possibly on a train.