A Lydian scale on the guitar fretboard

The A Lydian scale is made of A (the root), B (major second), C# (major third), D# (augmented fourth), E (perfect fifth), F# (major sixth) and G# (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.