iTunes U.S.

DOWNLOAD THIS: Island's got an out-of-nowhere story with teen troubadour Shawn Mendes' "Life of the Party," which bowed at #1 on the iTunes singles chart yesterday and ain't giving any ground so far. Capitol's Sam Smith is going strong with "Stay With Me," while another track he co-wrote and sang, Disclosure's "Latch" (Interscope), remains on the board. RCA's Sia, meanwhile, dances into the Top 10 with "Chandelier." Sam maintains momentum on the album side, while his labelmates 5 Seconds of Summer kick into high gear. Republic's Owl City, meanwhile, makes a splashy entrance with their new EP. Oh, and if you're squinting to read the above chart, click on it to make it bigger. We won't tell anyone. (6/27p)