C# Mixolydian — Lap Steel
Every note of C# Mixolydian as a bar position on the lap steel's six strings in C6 — the root ringed each time it recurs, and a button that plays the run.
C# Mixolydian is 7 notes to the octave (modes family), drawn here across the lap steel's six strings in C6 with every C# marked, so home stays visible from anywhere in the pattern.
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.
On a lap steel a scale is played by moving the bar: every note on a string sits a fret apart, and the tuning decides which neighbouring string holds the next one without a slide. These maps light every root so the bar always knows where home is.
Work it in one position before you work it up the neck. A bar that lands a hair short of the marker sounds flat on every string it covers, and the ear hears that long before the run is fast.