Pythagorean tuning is derived from the 3/2 frequency ratio, and has been believed by some to be the basis of many historical scales.

Pythagorean tuning uses steps of the frequency ratios 3/2 (702 cents) to generate steps of fifths;
and 4/3 (498 cents) to generate steps of fourths. This results in a spiral tuning yet the resultant harmony is generally agreed to be unsatisfactory.

Some authorities claim that this is the basis of all Indian tunings, and that North Indian scales are derived from steps of fifths in the sa - ma pattern; whilst the South Indian tuning uses steps of fourths in the sa - pa pattern. As Indian musical practice tends to contain many ornamentations, much vibrato, and glissando, this is doubtful.

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