What dance styles do background dancer have to be trained in?

1.Hip-Hop

2.Jazz

3.Musical Theater

4.Ballet

5.Contemporary

6.Tap

7.Acrobatics

8.Salsa

9.Merengue

10.Cumbia

11.Tango

12.Cha-cha

13.Bachata

14.Reggaeton

15.Belly dancing