Themeless versions of Purchased songs?

Some of the themes, it is just impossible to get a good score and drop alot of taps. This is ridiculous in gives you hell which is a hard song even unthemed. I really like having the ttr3 indicator which is just, you got it perfect or you didn't. In the theme versions I find myself missing the notes correct time by ages. The other problem with the themed ones is that on extreme they all go at different scales and paces so it is so confusing as to when to hit the note.
Can there either be a button to untheme the songs or just have a seperate download for the unthemed versions of the songs.