Before you complain in the comments that I missed a song, I got my list of songs from http://mlp.wikia.com/wiki/Songs, so unless the lead for the song was listed as either Rainbow Dash or Main Six, I didn't include it.  Also I didn't include any songs from Equestria Girls because it wasn't the true Rainbow Dash singing and/or it was in a different Equestria dimension or whatever Hasbro explanation to sell more toys was...