Construct a piece of music by converting the stated musical sequence into an alphabetical format and integrating the supplied motif.
X:1
L:1/8
M:6/8
K:G
['G2 G _B2']  
X:1
L:1/8
M:6/8
K:G
 D | G2 GAGA | _B3 G2 G | _B2 B c2 c | d4 z d | g2 d_BAG | d3 G2 G | _B2 c B2 A | G4 z |]  