I want frequency numbers of english latters to use it for C++ sound function?

My target is to write a C++ that can play letter sounds. like A,B,C,...

I want frequency numbers of english latters to use it for C++ sound function?
Here is one octave worth.





A440


A#466.1


B493.8


C523.2


C#554.3


D587.3


D#622.2


E659.2


F698.4


F#740


G784


G#830.6