Here is the 40th M6A. I always wanted to cover this song at some point. And here we go.

Applejack - Alto 2 (Lowest part)
*Lead Vocals/Bass Line 1
Twilight Sparkle - Alto 1 (Second Lowest Part)
*Bass Line 2/Lead Vocals
Rainbow Dash - Soprano 2 B (Third Lowest Part)
*Percussion 1/Lead Vocals
Pinkie Pie - Soprano 2 A (Third Highest Part)
*Piano/Lead Vocals/Percussion 2
Rarity - Soprano 1 B (Second Highest Part)
*Strings 1/Lead Vocals
And Fluttershy - Soprano 1 A (Highest Part)
*Strings 2/Lead Vocals/Guitar