It's Not Billboard; it's Lillboard! (My Top 50 Songs Of 2015!)

50. Elle King - Ex's & Oh's
49. Shawn Mendes & Camila Cabello - I Know What You Did Last Summer
48. O-Town - Chasin' After You
47. Gwen Stefani - Used To Love You
46. Ariana Grande - Focus
45. Jessie James Decker - Lights Down Low
44. Kelly Clarkson - Piece by Piece
43. Pentatonix - Sing
42. Charlie Puth - One Call Away
41. Shawn Mendes - Stitches
40. Becky G - Break A Sweat
39. Adele - Hello
38. Demi Lovato - Cool For The Summer
37. Meghan Trainor - Better When I'm Dancin
36. Ben Haenow (feat Kelly Clarkson) - Second Hand Heart
35. Thomas Rhett (feat Jordin Sparks) - Playing With Fire
34. Halestorm - Amen
33. Jillian Jensen - Better Off
32. Jessie James Decker - Girls Night
31. Cassadee Pope - I Am Invincible
30. Vanessa Carlton - Operator
29. Danielle Bradbery - Friend Zone
28. Jordin Sparks - Double Tap
27. Carly Rae Jepsen - I Really Like You
26. Karmina - Go To Paris
25. Justin Bieber - Sorry
24. Jennifer Lopez - Feel The Light
23. Nick Jonas - Levels
22. Kristine Mirelle - You Oughtta Know
21. Jem and the Holograms - Youngblood (Hilary Duff, Aubrey Peeples, Stefanie Scott)
20. Wiz Khalifa (feat Charlie Puth) - See You Again
19. Kelly Clarkson - Invincible
18. Jess Glynne - Don't Be So Hard On Yourself 
17. Meghan Trainor (feat John Legend) - Like I'm Gonna Lose You
16. Rihanna - Dancing In The Dark
15. Tori Kelly - Should've Been Us
14. Taylor Swift - Style
13. Jordan Smith - Chandelier (Sia Cover)
12. One Direction - Drag Me Down
11. Hailee Steinfeld - Love Myself  
10. Selena Gomez - Same Old Love: some of her songs are better than others, and this is one of those better songs (from her previous singles on this album)
9. Rachel Platten - Stand By You: she makes her "Top 50" debut (and it's in the Top 10)!
8. Jessie J - Flashlight: I've liked this song since the first day I heard it (i even like the movie version)
7. Fifth Harmony (feat Kid Ink) - Worth It: I love them, but not one of my fave songs of theirs
6. Ellie Goulding - Love Me Like You Do: this song was WAY overplayed, but still good
5. Kristine Mirelle - Are You That Somebody? (Aaliyah Cover): I saw her cover this song in person and I was just like "WOW" - she does it really, REALLY well.
4. Taylor Swift (feat Kendrick Lamar) - Bad Blood: she was in the top 3 last year, but top 5 is still great!
3. Kelly Clarkson - Heartbeat Song: one of my favorite singers ended her year in the top 3, so not too bad at all (she was number 1 in 2007, and top 5 a few times too)
2. Rachel Platten - Fight Song: this song would've been number 1 if we went by "relatable songs of 2015"
1. Little Mix - Black Magic: another year, and another catchy song got the top spot!