how to print random letters from a set in c language in terminal?

I want to print every 2 Seconds a random music note on the terminal, to practices on my ocarina. The set of the music notes is (A, B, C, D, E, F and G), that is the code i need help with ,since i am new to coding.

---

  #include <stdio.h>
  #include <unistd.h>
   int main(){
              char A, B, C, D, E, F, G;
              char notes[7] = { A, B, C, D, E, F, G };

              while (1) {

                         printf("%c\n", notes);
                         sleep(2);

                         }
   }

---

I get this error when compiling.

warning:format ‘%c’ expects argument of type ‘int’, but argument 2 has type ‘char*’ [-Wformat=] printf("%c\n", notes);

When i change the %c in printf to %s all i get in the terminal "@" every 2 Seconds, what am i doing wrong? for the other part of my question how to add the print random notes which code i need to add?

thanks for helping.