+1 on Nativedsd, but I don't know if Peter is set up for DSD. Peter I don't know what you can and can't tell just listening to a MacBook with headphones. If you stay with this hobby you will quickly improve your setup, and in that case it behoves you to buy high end downloads now. The thing with HDTracks or ITunes is you are not getting the original recording, but a master that if set up to sound good on a car sound system. There as a few really good recording companies but you have to search tham out and that for me is the hardest part of this hobby. Finding the music files. My favorite recordings come from Nativedsd,2L,Linn and Channel Classics. Your not going to get ripped off with some recycled crap off these sites.