Perez Hilton found a YouTube video with that contains the complete audio of Ashley Tisdale doing a cover of Rick Astley's "Never Gonna Give You Up."
The Perez-linked video looks like it's unauthorized, but a post by Idolator has links to authorized excerpts. Turns out the song is a cut from Tisdale's new Disney album, "Degree Girl: OMG! Jams." As in, the album is an advertisement for deodorant. I don't know what Ashley thinks of being subliminally associated with sweat and body odor, but somehow I doubt she cares.
As for the song I am unable to call it terrible (disclosure: I like "Never Gonna" way more than I should after having listened to it 5,000 times when I was writing about it). I listened to the Tisdale version all the way through, and even noticed my foot moving several times. It might have just been twitching.
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