Letters put together form a key to chords
from Rakim – Don't Sweat The Technique Lyrics on Rap Genius
Meaning
Comparing the English language to music… GENIUS!
In music, the letters A through G represent key that you would see on a sheet. When you hit more than one of those keys together, they form a chord.
Example:

When you put letters together, they form words… words form sentences… and sentences create the lyrics: MUSIC/ART!
When you put keys together, they form chords… chords form melodies… and melodies create the instrumental: MUSIC/ART!
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