#40. Bruno Mars - "Just The Way You Are"

(Photo by Ian Gavan/Getty Images)

#39. Bruno Mars - "Grenade"

(Photo by Ethan Miller/Getty Images for Clear Channel)

#38. Bruno Mars - "It Will Rain"

(Photo by Ethan Miller/Getty Images for Clear Channel)

#37. Britney Spears - "Till The World Ends"

(Photo by Patrik Jonsson/Getty Images)

#36. Lupe Fiasco - "The Show Goes On"

(Photo by Kevin Winter/Getty Images)

#35. Katy Perry - "E.T."

(Photo by Graham Denholm/Getty Images)

#34. Jennifer Lopez - "On The Floor"

(Photo by Ethan Miller/Getty Images for Clear Channel)

#33. Keri Hilson - "Pretty Girl Rock"

(Photo by David Livingston/Getty Images)

#32. T-Pain - "5 O'clock"

(Photo by Kevin Winter/Getty Images)

#31. Black Eyed Peas - "Just Can't Get Enough"

(Photo by Christopher Polk/Getty Images for Clear Channel)

#30. Flo Rida - "Good Feeling"

(Photo by Ethan Miller/Getty Images)

#29. Edward Maya - "Stereo Love"

(Photo by Jordan Strauss/Getty Images for Bud Light)

#28. Nicki Minaj - "Moment 4 Life"

(Photo by David Livingston/Getty Images)

#27. Rihanna - "S&M"

(Photo by Bryan Bedder/Getty Images)

#26. Jeremih - "Down On Me"

(Photo by Jeffrey Ufberg/Getty Images)

#25. Chris Brown - "Look At Me Now"

(Photo by Kevin Winter/Getty Images)

#24. Pitbull - "Give Me Everything"

(Photo by Neilson Barnard/Getty Images for Latina Magazine)

#23. Kreayshawn - "Gucci Gucci"

(Photo by Jason Merritt/Getty Images)

#22. Lloyd - "Dedication To My Ex..."

(Photo by Jason Merritt/Getty Images)

#21. Adele - "Rolling in the Deep"

(Photo by Michael Loccisano/Getty Images)

#20. Lady Gaga - "You and I"

(Photo by Ethan Miller/Getty Images for Clear Channel)

#19. DJ Khaled - "I'm On One"

(Photo by Kevin Winter/Getty Images)

#18. Adele - "Someone Like You"

(Photo by Dave Hogan/Getty Images)

#17. Kelly Rowland - "Motivation"

(Photo by Kevin Winter/Getty Images)

#16. David Guetta - "Without You"

(Photo by Ethan Miller/Getty Images for Clear Channel)

#15. Gym Class Heroes - "Stereo Hearts"

(Photo by Scott Gries/Getty Images)

#14. Bad Meets Evil - "Lighters"

(Photo by Kevin Winter/Getty Images)

#13. LMFAO - "Sexy and I Know It"

(Photo by Mike Coppola/Getty Images)

#12. Cobra Starship - "You Make Me Feel"

(Photo by Imeh Akpanudosen/Getty Images)

#11. Afrojack - "Take Over Control"

(Photo by Michael Tullberg/Getty Images)

#10. LMFAO - "Party Rock Anthem"

(Photo by Mike Coppola/Getty Images)

#9. Rihanna - "Cheers"

(Photo by Kevin Winter/Getty Images)

#8. Foster The People - "Pumped Up Kicks"

(Photo by Jason Kempin/Getty Images)

#7. Alexandra Stan - "Mr. Saxobeat"

(Photo by Andreas Rentz/Getty Images)

#6. Nicki Minaj - "Super Bass"

(Photo by Ethan Miller/Getty Images for Clear Channel)

#5. Katy Perry - "Last Friday Night"

(Photo by Kevin Winter/Getty Images for VH1)

#4. Lil Wayne - "How To Love"

(Photo by Kevin Winter/Getty Images)

#3. Britney Spears - "I Wanna Go"

(Photo by Ethan Miller/Getty Images for ABC)

#2. Dev - "In The Dark"

(Photo by Jag Gundu/Getty Images)

#1. Maroon 5 - "Moves Like Jagger"

(Photo by Kevin Winter/Getty Images)