Yeh.. it's a challenge to play over it. It really forces you move around the modes a little.. I find that the 6th note of the E Major scale doesn't sound good in some places but sounds fine in others. I won't try to over analyse it as I am not a professional but I have already had a little fiddle with it. It is also making me pay more attention to my picking hand because of the low levels in the backing track.. so I need to be more precise in sounding my notes rather than letting my left hand run all the notes together. I'll do a rough take sometime tonight and post it as my "first impressions" take. :)