Piano Fills With D# Mixolydian

D# Mixolydian runs 7 notes to the octave. Below it is lit across two octaves of this chair's keyboard with every key numbered by degree, because what a fill needs mid-song is not the run — it is which degree the right hand is sitting on when the chord changes under it.

Major with a flatted 7th (b7) — bright and bluesy. The dominant chord turned into a tonal center with a rock/folk edge.

Heard in: "Sweet Home Chicago", "Norwegian Wood" (Beatles), Celtic and folk music — anywhere a major sound needs a darker, looser edge.

A piano fill lives in the right hand over a left hand that never stops comping, so the scale is read two ways at once — which notes sing over the held chord, and which ones walk the song into its turnaround.

Work it over a held left-hand chord until the right hand stops thinking about the order, then take it to a song in D# and let the melody choose which notes the fill keeps.