Major Chords
C major chord
C-E-G = C-E + E-G Now, the first interval we have is C-E, which is a major 3rd. The 2nd interval we have is E-G, which is a minor 3rd. Thus, we come to the conclusion that a major chord is made up of 2 intervals: major 3rd on top, minor 3rd on bottom
*There is also a 3rd interval, C-G which is a perfect 5th between the root and last note. This interval is not really necesarry to memorize cuz if you have your intervals of 3rds right, then the the interval of a 5th will already be present. But it is good to know!!!
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Here are the rest of the major chords from Part 1:
Cb major
Cb-Eb-Gb = Cb-Eb + Eb-Gb, Cb-Eb = major 3rd, Eb-Gb = minor 3rd
C# major
C#-E#-G# = C#-E# + E#-G#, C#-E# = major 3rd, E#-G# = minor 3rd
Db major
Db-F-Ab = Db-F + F-Ab, Db-F = major 3rd, F-Ab = minor 3rd
D major
D-F#-A# = D-F# + F#-A, D-F# = major 3rd, F#-A = minor 3rd
D# major
D#-F##-A# = D#-F## + F##-A#, D#-F## = major 3rd, F##-A# = minor 3rd
Eb major
Eb-G-B = Eb-G + G-Bb, Eb-G = major 3rd, G-Bb = minor 3rd
E major
E-G#-B = E-G# + G#-B, E-G# = major 3rd, G#-B = minor 3rd
E# major
E#-G##-B# = E#-G## + G##-B#, E#-G## = major 3rd, G##-B# = minor 3rd
Fb major
Fb-Ab-Cb = Fb-Ab + Ab-Cb, Fb-Ab = major 3rd, Ab-Cb = minor 3rd
F major
F-A-C = F-A + A-C, F-A = major 3rd, A-C = minor 3rd
F# major
F#-A#-C# = F#-A# + A#-C#, F#-A# = major 3rd, A#-C# = minor 3rd
Gb major
Gb-Bb-Db = Gb-Bb + Bb-Db, Gb-Bb = major 3rd, Bb-Db = minor 3rd
G major
G-B-D = G-B + B-D, G-B = major 3rd, B-D = minor 3rd
G# major
G#-B#-D# = G#-B# + B#-D#, G#-B# = major 3rd, B#-D# = minor 3rd
Ab major
Ab-C-Eb = Ab-C + C-Eb, Ab-C = major 3rd, C-Eb = minor 3rd
A major
A-C#-E = A-C# + C#-E, A-C# = major 3rd, C#-E = minor 3rd
A# major
A#-C##-E# = A#-C## + C##-E#, A#-C## = major 3rd, C##-E# = minor 3rd
Bb major
Bb-D-F = Bb-D + D-F, Bb-D = major 3rd, D-F = minor 3rd
B major
B-D#-F# = B-D# + D#-F#, B-D# = major 3rd, D#-F# = minor 3rd
B# major
B#-D##-F## = B#-D## + D#-F##, B#-D## = major 3rd, D##-F## = minor 3rd