A Lydian on Guitarrón

A Lydian runs 7 notes to the octave. Below it is mapped onto this instrument's A–D–G–C–E–A fingerboard with every A marked, because what a player needs mid-number is not the pattern but where the root is when the harmony moves under it.

Major with a raised 4th (#4) — dreamy, ethereal, and floating. Often called the brightest mode, with an otherworldly suspended quality.

Heard in: Film scores, progressive rock, jazz — Joe Satriani's "Flying in a Blue Dream", John Williams, Steve Vai.

The bass takes almost no melodic line, and that is precisely why these matter: the notes between one root and the next come out of a scale, and an approach that lands wrong is the loudest wrong note in the ensemble.

Take it slowly against the playback until the geometry stops being geometry, then put it under a number in A and let the written line pick its own notes out of it.