probaly hardest stuff i think to play is stuff by Gary Moore. kind of a blues rock feel with difficult bends and very fast in parts and its difficult to get the feel. i find it harder although it is slower than playing Eugienes trick bag (the amazing arpeggios from the film crossroads)this uses very big stretches and you have to run up and down the strings very fast but i still find it harder to get the feel for playing Gary Moore stuff.