Hey Friend,
The next interval in a major scale is the major third.
Tonic - we call this the root note most of the time; it’s the first note of the scale. In the key of C major, this note would be C.
Major Second - this is one whole step (tone) above the tonic. In the key of C major, this note would be D.
Major Third - two hole steps above the tonic. In the key of C major, this note would be E.
Perfect Fourth - five half-steps above the tonic. In the key of C major, this note would be F.
Perfect Fifth - seven half-steps above the tonic. In the key of C major, this note would be G.
Major Sixth - nine half-steps above the tonic. In the key of C major, this note would be A.
Major Seventh - eleven half-steps above the tonic. In the key of C major, this note would be B.
Perfect Octave - six whole steps above the tonic. In the key of C major, this note would be C.
This note is two whole steps above the tonic in pitch. In the key of C major, the third interval lands on an E note.
1 2 3 4 5 6 7 (8)
C D E F G A B (C)
| | | | | | |
W W H W W W H
I also want to point out that this interval (the major third) is THE key component in a major chord to determining the emotional effect of that chord. The major third note is what causes a major chord trigger a happy feeling.
Keeping the other two triad notes the same (the tonic and the fifth) and changing the major third to something else shifts the sound to something entirely different. If the interval changes to a minor third, the chord now sounds sad.
Drop the pitch lower to the major second and the chord becomes a suspended 2 chord (sus2), which gives off a feeling of hopeful anticipation. Raise it to the perfect fourth interval and you'll get an optimistic sound as a suspended 4 chord (sus4).
I’ve linked to a PDF and MP3 that first has the major third interval demonstrated, then examples of songs using this major third interval.
Please bear in mind, I did not change the tempo for any of the example songs. So yes, they’re slow!
This will help you practice them without the need to worry about speed. For these exercises, it’s more important to listen for the interval. This is training your ears and helping you develop muscle memory in your fingers.
If you really want to accelerate your ear training, hum or sing the notes while you play along. This helps cement the sound of the interval in your mind.
I’ll catch you tomorrow!
Peace~
Dave | 
