This is a detailed well elaborated and structured lesson on Music intervals.
It however requires prior knowledge to introduction to Music, Major and Minor Chords, key signatures and a number of musical concepts.
Don't worry much, you can still find the prior prerequisites in the links below 👇

Introduction to music
[ Ссылка ]
Seventh chords
[ Ссылка ]

Key signature
[ Ссылка ]

ACCIDENTALS
[ Ссылка ]

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