Lady Gaga debuts at No. 1 on the Feb. 15-dated Hot Dance/Pop Songs tally with "Abracadabra," becoming the second chart-topper in the survey's five-week history. Tate McRae's "It's Ok I'm Ok" drops to No.

Lady Gaga has cycled through many iterations in the time we've known her: disco diva, Warholian punk, country-inflected barroom balladeer, star of movies both successful and not. But with the Grammy-night debut of her video for the new single "Abracadabra,