TAG, THEY'RE IT: ZEDD AND SELENA'S BIG SHAZAM

In case you harbored any lingering doubts, "I Want You to Know" by Zedd f/Selena Gomez (Interscope) is a friggin' monster. The track jumped 186 spots to #15 on the Shazam USA Top 100 Tags Chart this week, making it the greatest gainer by a considerable margin.

DCD2/Island's Fall Out Boy, meanwhile, saw a 135-spot gain for "Immortals," which undoubtedly owes a debt to a giant, compassionate robot. We speak, of course, of Disney's Big Hero 6, which hit pay cable with a splash recently--and which features the anthemic tune in a crucial moment.

Hip-hop gainers included "Post to Be," by Omarion f/Chris Brown and Jhene Aiko, Young Dolph's "Preach" (Paper Route Empire) and K Camp's "Lil Bit" (Family Ties/Interscope) while airplay boosted Sia's "Elastic Heart" (Monkey Puzzle/RCA) and Echosmith's "Bright" (Warner Bros.), among others. You can see the whole chart, sortable by rank, artist and biggest jumpers, here.

On the U.K. side, Jessie J's "Sexy Lady" is the big gainer, while Meghan Trainor's "Like I'm Gonna Lose You" shoots up 113 spots. BRITs critics' choice winner James Bay, meanwhile, moves #14-4 on the overall chart with "Hold Back the River." For more of what Britons are pointing their mobiles at, go here.