“I have listened to Taylor Swift’s album,” he continued. “Taylor Swift sort of fascinates me as a phenomenon because she’s so popular and I sort of quite like the whole thing. But then when I listen to the records, and we both have the same feeling actually, that for a phenomenon as big [as she is] … where are the famous songs? What is Taylor Swift’s ‘Billie Jean’?”

When someone suggests “Shake It Off,” Tennant responded with: “Is it though? No, ’cause I actually even know that that’s the answer, but I listened to that the other day, and it’s not ‘Billie Jean.’ It’s not… Melodically — she’s got a great voice, by the way, and the production’s beautiful — but melodically … it’s all sung one or two notes going up and down… But, anyway, it’s a fascinating thing.”

(http://www.autoadmit.com/thread.php?thread_id=5521792&forum_id=2#47611805)