A PREVIEW OF RADIO CHART PREVIEWS

Def Jam is playing a game of musical chairs at the top of the Pop chart, as Justin Bieber moves into the #1 spot with "Love Yourself" one week after Alessia Cara's "Here" claimed her first #1. Meanwhile, ZAYN and Lukas Graham are off and running.

At Rhythm, it's going to be a photo finish between Drake & Future's "Jumpman" (YMCMB/A1/Epic-Republic) and Tory Lanes' "Say It" (MadLove) for #1 this week—with Rihanna f/Drake (Westbury Road/Roc Nation/Def Jam) the highest debut—and at Modern Rock, RCA's Cage The Elephant take over the top spot with "Mess Around," for the group's sixth #1 at the format. In other Modern Rock news, Glassnote's Strumbellas move toward Top 20 and Florence and Lukas debut. Click the links for more info buddy.