
The modern Lydian musical scale is a rising pattern of pitches comprising three whole tones, a semitone, two more whole tones, and a final semitone. This sequence of pitches roughly describes the fifth of the eight Gregorian (church) modes, known as Mode V or the authentic mode on F, theoretically using B{music|♮} but in practice more commonly f...
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http://en.wikipedia.org/wiki/Lydian_mode

in music, fifth of the eight medieval church modes. See church mode.[3 related articles]
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http://www.britannica.com/eb/a-z/l/87

The mode starting on The fourth degree of The major scale
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http://www.encyclo.co.uk/local/20596

an authentic church mode represented on the white keys of a keyboard instrument by an ascending scale from F to F.
Found on
https://www.infoplease.com/dictionary/lydian-mode
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