I've never searched for Fleetwood Mac on iTunes since I own every Mac/solo album in CD/LP form. It is strange all of the Pre 1970 & post 1975 albums are present, yet no 1970-1974 albums are. I have a couple of guesses:
1) Maybe there is some sort of lawsuit involving Wendy Welch in regards to Bob's royalties since his passing? Perhaps she's holding Bob's rights as a way to strong-arm Fleetwood Mac into getting Bob inducted into the Rock & Roll Hall Of Fame?
2) Perhaps the Welch era albums are in the process of being remastered/rereleased? I know albums which are about to be remastered/rereleased go into Out Of Print status beforehand.
3) Could Warner Bros/Fleetwood Mac management be attempting to streamline Fleetwood Mac history by simplifying it?
I'm hedging my bet on some aspect of #1 being correct.
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