File content as of revision 0:05e1cec99ce1:

#include "mbed.h"

#define C3 131
#define D3 147
#define E3 165
#define F3 175
#define G3 196
#define A3 220
#define B3 247
#define C4 262
#define D4 294
#define E4 330
#define F4 349
#define G4 392
#define A4 440
#define B4 494
#define C5 523
#define A5 880
#define B5 988
#define Pause 1

Ticker tick;
DigitalOut led1(LED_RED);
DigitalOut led2(LED_GREEN);
DigitalOut gpo(D10);

void flip() {
    led2 = !led2;
    gpo = !gpo;
}

int main() {
    int Notes_Hz[] = {Pause, G4, F4, G4, Pause, D3, B5, A4, Pause, G4, E3, E4, E4, E4, F4, G4,Pause,
                      G4, F4, G4, Pause, D3, B5, A4, Pause, G4, E3, E4, E4, E4, F4, G4, Pause};
    int i;
    int bpm = 120;
    //tick.attach(&flip, 0.7); // setup ticker to call flip led2 after 0.7 seconds

    while (1) {
        i = 0;
        while (Notes_Hz[i]) {
            led1 = !led1;
            tick.attach(&flip, 0.5/Notes_Hz[i]);
            wait (50.0/bpm); // bpm = beats per minute
            tick.attach(&flip, 1);
            wait (10.0/bpm); // 
            i++;
        }
    }
}