1. iHeartRadio Music Festival in Las Vegas

2. Billie Eilish performs during the second day of the iHeartRadio Music Festival at the T-Mobile Arena in Las Vegas, Nevada, September 18, 2021. REUTERS/Steve Marcus

3. J. Cole performs during the first day, September 17, 2021. REUTERS/Steve Marcus

4. Lil Baby performs with dancers during the second day. REUTERS/Steve Marcus

5. Kid Laroi along with guitarist Omar Fedi performs during the second day. REUTERS/Steve Marcus

6. Sam Hunt performs during the second day. REUTERS/Steve Marcus

7. Billie Eilish performs with her brother Finneas during the second day. REUTERS/Steve Marcus

8. City Spud and Nelly perform during the first day. REUTERS/Steve Marcus

9. Cheap Trick guitarist Rick Nielsen performs during the first day. REUTERS/Steve Marcus

10. Billie Eilish performs during the second day. REUTERS/Steve Marcus

11. Switzerland's Roger Federer celebrates after winning his semi-final match against Spain's Rafael Nadal. REUTERS/Hannah McKay

12. Darius Rucker performs with a member of his band during the first day. REUTERS/Steve Marcus

13. Finneas performs during the first day. REUTERS/Steve Marcus

14. Billie Eilish performs during the second day. REUTERS/Steve Marcus

15. J. Cole (L) and Bas perform during the first day. REUTERS/Steve Marcus

16. Nelly (C) performs with Brian Kelley (L) and Tyler Hubbard of Florida Georgia Line during the first day. REUTERS/Steve Marcus

17. Walker Hayes performs during the first day. REUTERS/Steve Marcus

18. Lil Baby performs during the second day. REUTERS/Steve Marcus

19. Kid Laroi performs during the second day. REUTERS/Steve Marcus

20. Cheap Trick lead singer Randy Hogan performs with the band during the first day. REUTERS/Steve Marcus

21. Sam Hunt performs with members of his band during the second day. REUTERS/Steve Marcus

22. Nelly performs with Tyler Hubbard of Florida Georgia Line during the first day. REUTERS/Steve Marcus

23. Cheap Trick drummer Daxx Nielsen performs during the first day. REUTERS/Steve Marcus