Guitar: C# Mixolydian Over the Changes

C# Mixolydian runs 7 notes to the octave, laid out here on EADGBE with every C# flagged. Mid-chorus the pattern is not what you need; where the root is when the chord changes underneath you is.

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 guitar chorus is a single line with the comp dropped, so a scale here is what the picking hand walks through between the two or three phrases it actually meant to play.

Play it slowly against the audio until it stops being a shape, then put it over two bars of a form and let the chord tones decide which of the notes you actually keep.