10.1Start with C major 7

C major triad:

C E G

Add the major 7th:

B

So:

Cmaj7 = C E G B

= до ми соль си

Scale-degree formula:

1 3 5 7

Play:

C major:

C E G

then:

Cmaj7:

C E G B

The maj7 sounds less plain, more spacious and sophisticated.