Compare
Lydian vs Lydian Augmented
Lydian + raised 5. The 3rd mode of melodic minor; jazz-fusion's signature 'floating' tonality.
Lydian
R
♭2
2
♭3
3
4
♭5
5
♭6
6
♭7
7
Lydian Augmented
R
♭2
2
♭3
3
4
♭5
5
♭6
6
♭7
7
What's different
Only in Lydian
5
Only in Lydian Augmented
♭6
In both
R23♭567
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