Finally finished :D
Technically they're both singing and dancing.
I may have made some outlines too thick, but other than that it seems…OK.

Filles on top row (Left to Right):
Berrry Pinch, Dinky Doo aka Dinky Hooves, Tornado Bolt, and Cotton Cloudy

Fillies in middle row (Left to Right):
Angela, Princess Erroria, Sweetie Belle, and Rowena

Fillies in bottom row (Left to Right):
Aura, Pina Colada, Tootsie Flute, and Noi

PS. They're all canon except for Angela and Rowena. You may not have heard of Tornado Bolt, Princess Erroria, Pina Colada, or Noi cause they have placeholder names.

Vector:
Noi belongs to :iconlumorn:

Background:
:iconthe-mystery-of-doom: