The pitch intervals for economy seating reported in the newsletter were mostly 31, 32, 33 and 34 inches, with a few at 30 inches.

(His discovery was the relationship of certain pitch intervals to numerical ratios.)

In atonal or musical set theory there are numerous types of intervals, the first being ordered pitch interval, the distance between two pitches upward or downward.

One can also measure the distance between two pitches without taking into account direction with the unordered pitch interval, similar to the interval of tonal theory.

Each instrument has its own repertory of pitch intervals and its own structural speed.

For example the pitch A4, or 9, transposed by a major third, or the pitch interval 4:

The special sound is partly accounted for by modes, which differ from keys in the way the pitch intervals vary.

As there is no concept of absolute pitch in Indian classical music, any convenient tuning maintaining these relative pitch intervals between the strings can be used.

Pitch inversion by an ordered pitch interval may be defined as:

They could not maintain a stable pitch, nor could they sing the correct pitch intervals that were written in the music.