Just googled 'KT Tunstall Abba' to see if anyone else noticed this. Not surprised they have. Sounds just like Winner takes it all. I can't even listen to this song without subconsciously singling the next line as the Abba lyric.
Why do I always look up when I hear her voice?
Why do I always tap my foot when I hear the tunes of her songs?
Why do I always sing when I hear her coming out of last fm?
Well, simply cause her music is stuck on me :p