Another strange one. For example "Nation's Favourite 80's No1s" in UK has about half the songs greyed out and unavailable. Searching one of the greyed out songs brings it up and is playable - eg. "Every breath you take" is greyed out in the album but searching for it individually brings up the original Police version, and it's playable. Is this a glitch to be sorted out or a real anomaly that will stay with Apple Music?