1)C 2)D 3)E 4)F 5)G 6)A 7)B 8) just back to C again!
By pressing 1,3,5 on your piano, you are actually pressing the C chord, and this is called triad chord. Press these 3 keys together and listen to the sound of the chord.
Apply 135 rule on F key to find the F chord, it is 3)F,5)G ,7)B (135 rule) you are pressing F chord.
How about G Chord? it would be 5)G,7)B,2)D. Interesting?
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