Off of Brittni’s self-titled new album is Csardas. This is probably the most advanced tab I have done yet. The first section is packed with tremolo. The second is a speed exercise, and the last is a key change to Em. This should be a fairly good challenge for most intermediate-adv. musicians.
There is a video of Brittni performing this song on Youtube: http://www.youtube.com/watch?v=MHDPBWc2hcQ