This week's charts saw Selena Gomez score her second No. 1 album, One Direction extending records and more. Here are 13 things you need to know about the Billboard charts this week:
5. Twenty One Pilots act as one of only two bands on the Hot 100 chart with songs written by one person. The charts have been experiencing an intense decline in one-manned hits. Read the full story here.
6. One possible reason Jamie Lynn Spears wasn't in the Zoey 101 reboot clip could be because she was too busy debuting on the Billboard Hot 100. Spears co-wrote Jana Kramer's new single "I Got The Boy." Read the full story here.
12. There's still some "Bad Blood" between these two pop stars as Taylor Swift's "Wildest Dreams" hits No. 1 on the Adult Pop Songs airplay chart, becoming the fifth leader from 1989. Previously, only Katy Perry's Teenage Dream had led with five hits on the chart. Read the full story here.