46.7Compare two upper structures

Over B:

D major

D-F♯-A

= ♭3, 5, ♭7.

Clearly B-minor-ish.

C major

C-E-G

= ♭2, 4, ♭6.

Clearly Phrygian.

Alternate:

D/B

C/B.

Already a compelling intro.