The major scale, one of the diatonic scales, consists of diatonic intervals. The intervals in the major scale and the frequency ratios they correspond to are second (9:8), major third (5:4), fourth (4:3), fifth (3:2), major sixth (5:3), major seventh (15:8), and octave (2:1).

Diatonic Interval, Minor Scale, Perfect Interval

References

Blackwood, E. The Structure of Recognizable Diatonic Tunings. Princeton, NJ: Princeton University Press, 1986.

Culver, C. A. Musical Acoustics, 4th ed. New York: McGraw-Hill, 1956.

Jeans, J. Science and Music. New York: Dover, 1968.

Steinhaus, H. Mathematical Snapshots, 3rd American ed. New York: Oxford University Press, p. 299, 1983.