A, E, I, O, U are the voWels of language and sounds outside of language. Sound out the voWels right now and you'll hear the frequency from A-U go high to low. That's why when you hear someone say "hey, you." Everyone reacts or looks at the direction of where the lower vibrational sound of U came from. Just like when someone is cheering in joy, happiness, or glee; they say "Ayyy." It's already in us to feel these frequencies.
One thing I would like to say also, out of all the letters, W is sounded like "double U" and the shape of W is like the vital signs of your heart "beat", also similar to the frequencies of energy. (the image of the letter W)
(A,E,I,O,U)
(Sol,Fa,Mi,Re,Do)
Ti is transcending energy or intent, and other things I can't describe with language.
Ti-Do represents a energy cycle, wether it be high or low.
