Today I'm going to teach you about the interval of the major second in major key. The interval of the major second is simply the distance from C to D. It's like a whole tone. It can be measured it two ways - in scale degrees and in steps.
In scale degrees - from C to D there are two scale degrees.
In steps - it's a whole tone.
Let's first figure out how many major seconds there are in C major scale.
From the 1st scale degree (C-D) - it's a major second.
From the 2nd scale degree (D-E) - it's a major second.
From the 3rd scale degree (E-F) - it's a minor second.
From the 4th scale degree (F-G) - it's a major second.
From the 5th scale degree (G-A) - it's a major second.
From the 6th scale degree (A-B) - it's a major second.
From the 7th scale degree (B-C) - it's a minor second.
So you see that there are 5 different major seconds in every major key (from the 1st, 2nd, 4th, 5th, and 6th scale degrees). Since I showed you how to construct them, now we can talk about how you can resolve these dissonant intervals.
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