I just might give that a shot.
I have noticed that some of the vintage CDs that get remastered have changed the pitch of the vocals and other instruments so much that they only resemble the original recordings that you heard on the radio. This tends to affect earlier recordings, late 60s psychedelic and garage.
One of the inexpensive compilation downloads I purchased on iTunes was terrible, I'd much rather listen to the original mix of " I had too much to dream last night" than the remaster, which destroyed the song completely.
I guess I'm suspicious of iTunes files in general. I am a dying breed, using separate amps and pre-amps and real speakers as well as Ultimate Ear earbuds and a great car system. The cuts that are engineered for iTunes are mixed for lo-fidelity appliances and just don't sound that good.