C Lydian scale on the guitar fretboard

The C Lydian scale is made of C (the root), D (major second), E (major third), F# (augmented fourth), G (perfect fifth), A (major sixth) and B (major seventh). The fretboard shows every one of them across the neck in standard tuning (E A D G B E), and plays them back so you can hear the scale.

The Lydian mode is the fourth mode of the major scale, a major scale with a raised fourth. The raised fourth sits a tritone from the root, and the scale shares its notes with a major scale a fifth above. It is the brightest of the seven modes.