Song list:
1. Avicii - "Wake Me Up"
2. Britney Spears - "Till the World Ends"
3. Calvin Harris - "I Need Your Love" (ft. Ellie Goulding)
4. Chris Brown - "Yeah 3X"
5. David Guetta & Sia - "Titanium" (ft. Sia)
6. David Guetta & Usher - "Without You" (ft. Usher)
7. Enrique Iglesias - "Tonight (I'm Lovin' You)" [ft. Ludacris, DJ Frank E]
8. Etta James - "Something's Got a Hold on Me"
----Sampled by Avicii - "Levels"
----Sampled by Flo Rida - "Good Feeling"
9. Jason Derulo - "In My Head"
10. Jay Sean - "Down" (ft. Lil Wayne)
11. Justin Bieber - "As Long As You Love Me" (ft. Big Sean)
12. Karmin - "Brokenhearted"
13. Ke$ha - "C'mon"
14. Ke$ha - "Die Young"
15. Ke$ha - "We R Who We R"
16. Lady Gaga - "Just Dance"
17. Lana Del Rey - "Summertime Sadness"
18. Maroon 5 - "Daylight"
19. Maroon 5 - "Moves Like Jagger" (ft. Christina Aguilera)
20. Miley Cyrus - "Wrecking Ball"
21. Nicki Minaj - "Starships"
22. One Direction - "What Makes You Beautiful"
23. OneRepublic - "Apologize" (ft. Timbaland)
24. OneRepublic - "If I Lose Myself"
25. Owl City - "Good Time" (ft. Carly Rae Jepsen)
26. Pitbull - "Give Me Everything" (ft. Ne-Yo, Afrojack, Nayer)
27. PSY - "Gangnam Style (강남 스타일)"
28. Rihanna - "Where Have You Been"
29. Selena Gomez & The Scene - "Love You Like a Love Song"
30. Swedish House Mafia - "Don't You Worry Child" (ft. John Martin)
31. Taio Cruz - "Break Your Heart" (ft. Ludacris)

No copyright infringement intended. 
I am not making any money from this mashup. 
It is solely for entertainment purposes. 
Original music and videos are rightfully owned by their respective artists/companies.