function song = makesong(keys1,keys2,keys3,dur1,dur2,dur3,piano);

notes1=[];
for i=1:length(keys1);
    notes1=[notes1 note(keys1(i),dur1(i),piano)];
end
notes2=[];
for i=1:length(keys2);
    notes2=[notes2 note(keys2(i),dur2(i),piano)];
end
notes3=[];
for i=1:length(keys3);
    notes3=[notes3 note(keys3(i),dur3(i),piano)];
end

x=length(notes1);
y=length(notes2);
z=length(notes3);
if x<y
    notes2=notes2(1:x);
else
    notes1=notes1(1:y);
end
if x<z
    notes3=notes3(1:x);
else
    notes1=notes1(1:z);
    notes2=notes2(1:z);
end

song=notes1+notes2+notes3;

clear notes3;clear notes2;clear notes1;clear dur3;
clear keys1;clear keys2;clear keys3; clear dur1;clear dur2; clear i;