1. "Same Old Love" but brand-new chart moves: This week, Selena Gomez earned her fourth top 10 on the Billboard Hot 100 and her second from her latest album, Revival. Read the full story here.
2. 1989 and 2015 merged this year as Taylor Swift's latest album dominated. At the end of the year, the "Shake It Off" singer earned the title of Billboard’s top artist of 2015. Read the full story here.
3. Country music took the country itself by storm this year. As in 2014, Luke Bryan is 2015's Top Male Country Artist. Latin music has also had a good year, especially Romeo Santos, who was named 2015's Top Latin Artist. Read the full stories here and here.
4. Canadian Invasion! This week, seven of the top 10 songs are by maple-syrup-and-moose-lovin' artists (sorry, Canada). Read the full story here.
5. Adele, Adele, Adele. Just when you think she can't continue making headlines, she does exactly that. Her third studio album, 25, earns its second week at No. 1 on the Billboard 200. Read the full story here.
6. We now know where Alessia Cara is when she says "here," and the answer is No. 1. The singer's debut single tops the Rhythmic Songs airplay chart. Read the full story here.
7. The Billboard 200 chart has gone a cappella as Pentatonix’s That’s Christmas to Me hits No. 3. Read the full story here.
8. First lady Michelle Obama is first somewhere else as well: the real-time Billboard + Twitter Trending 140 chart. Her College Humor-produced “Go to College" rap video earned her No. 1. Read the full story here.
9. "Listen" to this No. 1: David Guetta is back on top of Billboard's Top Dance/Electronic Albums. Read the full story here.
10. Just call him "Daddy" of the charts -- or maybe don't. Either way, Psy is back and better than ever. His latest track is new at No. 6 on Hot Dance/Electronic Songs. Read the full story here.
11. "Nothin' Like You" and nothin' like these charts, is probably what Dan + Shay are thinking as their song hits No. 1 on Billboard's Country Airplay chart. Read the full story here.
12. The Killers are killin' it. The Killers' 10th holiday single -- featuring legendary actor Richard Dreyfuss -- arrives on Billboard's charts."Dirt Sledding" bows at No. 21 on Alternative Digital Songs and No. 23 on Rock Digital Songs. Read the full story here.
13. Following the death of former frontman Scott Weiland, multiple Stone Temple Pilots songs scale the LyricFind U.S. chart -- at No. 1 is fan favorite "Plush." Read the full story here.