iTunes charts

DOWNLOAD THIS: The iTunes charts are more fluid than usual, even for changeover Tuesday, as Republic's Ariana Grande (who else?) knocks Epic sensation Meghan Trainor off the top perch, at least for the moment, U.K. hit tandem Clean Bandit and Jess Glynne seek to repeat the feat over here and (we never thought we’d be writing this) Darius Rucker’s Motley Crue cover makes its initial appearance. Albums-wise, two hit compilations frame eight—count ’em, eight—newcomers, including potential staples from Island’s Gaslight Anthem, RCA’s Pentatonix (in pre-order; see item below), Astralwerks’ Porter Robinson, Capitol’s Troye Sivan and indie phenom FKA twigs. If you like variety, this is your big day. (8/12a)