Wiz Khalifa's "See You Again," featuring Charlie Puth, matches an historic mark, as it leads the Billboard Hot 100 for a 12th week. With its latest frame on top, it ties the record for the longest run at No. 1 ever for a rap single. Plus, OMI's "Cheerleader" takes over as the top-selling song in the country, Taylor Swift's "Bad Blood," featuring Kendrick Lamar, is the new most-heard song, and two singles reach the Hot 100's top 10, by Skrillex & Diplo, with Justin Bieber, and Rachel Platten.