\p1={CDEC | CDEC }
\p2={EFG2 | EFG2 | G/2A/2 G/2F/2E C|G/2A/2 G/2F/2E C}
\p3={CG,C2 | CG,C2}

\canon2v(p1;p2;p3;v1)=
{[V:1] p1 |: p2 | p3 |1-3 p1 :|4 v1 |]        
 [V:2] v1 |: p1 | p2 |1-3 p3 :|4 p3 |]
}

X:1
T: Frere Jacques (2 voice)
M: 4/4
L: 1/4
K: C
\canon2v(\p1;\p2;\p3; Z2)