\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}

X:1
T: Frere Jacques (2 voice)
M: 4/4
L: 1/4
K: C
[V:1] \p1 |: \p2 | \p3 |1 \p1 :|2 Z2  |]        
[V:2] Z2  |: \p1 | \p2 |1 \p3 :|2 \p3 |]