Make my own round? I took the easy way out, I picked the 1 major mode we haven’t done a round on Mixolydian.

Mixolydian is distinguishable by it’s flat 7th from the major scale, thus giving the tonic a dominant tonality.

I think of it as Major Dark.

http://en.wikipedia.org/wiki/Mixolydian _ mode

Pretty simple backing track, verses are all D Mixo, working over variants of a 3rd inversion D 7. Bridge is BbMaj7 to A, then B C G D Chorus.

Melody leans heavy on the flat 7 … that’s kinda the point :)