Harmonic third interval example

A harmonic interval occurs when two notes are played at the same time. ... For example, taking C as the tonic (the "1" or the first degree of the scale), then the third degree of the C major scale is E, so the interval between C and E is called a major third.

1. What is a 3rd interval in music?
2. What's a harmonic interval?

What is a 3rd interval in music?

In classical music, a third is a musical interval encompassing three staff positions (see Interval number for more details), and the major third ( Play (help·info)) is a third spanning four semitones. Along with the minor third, the major third is one of two commonly occurring thirds.

What's a harmonic interval?

: the pitch relation between simultaneous musical tones.