I heard about this website on a favourite Podcast I never miss: Inside Home Recording.
They mentioned this website and it has sucked my life away:
This very knowledgeable fellow has posted RAW tracks from famous recordings. For instance today he features the isolated bass track from the Beatles “While my guitar gently weeks”. A fascinating behind the scenes look into the playing of one of modern music’s masters. Educational and inspiring.
Tons of insightful articles on music, musicianship and just about every thing else music related as well. If you’re involved in creating music for fun or for profit, this is a site to open every morning (I do).
Please Note: This site will suck up all your available time, so use caution when visiting. He’s taken days from me — damn him — sure hope he don’t quit.