Only had time to listen to "Alegro". Really nice progression... man, I would love to shred all over that! I love the arpeggiated sequence, it would sound very Beckerish if played a little faster as a lead part. Ever think about playing that as a solo part (with distortion)? Would be tough to get just right but I think it would kick ass;-)

As far as the lead goes, it has a nice structure to it and helps maintain a melodic framework. My only complaint (and its small) is the tone on the lead guitar. Personally I prefer very little or no delay and reverb, I find that it makes melodies a lot stronger when they are played without any effects, then maybe add a little EQ and compression to the mix. Don't ask me for any tips on getting a good tone though, I just keep it simple with basic distortion.

If I was going to overlay some lead, I would personally play something neo-classical as a counterpoint to the root notes of each bar on the accoustic parts. Kind of toying with the backing part as if it were the left hand on a piano piece. Anyway, thats just me, not everyone is into shred!

Keep up the good work, I'll try to check out the other pieces later.