Banjo Fills With D Mixolydian
Where D Mixolydian lies on Banjo's fretboard, and the fill it feeds.
D Mixolydian runs 7 notes to the octave. Below it is laid onto this chair's GDGBD fretboard with every D marked, because what a fill needs mid-song is not the pattern — it is where the root is 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 banjo fill is usually still a roll, with the melody notes pushed to the top of it — the scale says which notes the fretting hand can put there, while the open strings and the high drone on the short fifth string keep ringing underneath.
Play it slowly against the audio until the shape stops being a shape, then take it to a song in D and let the melody pick its own notes out of it.