Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
M:2/4
K:G
['D GGGA FEDD GGAc B2 z A']  
X:1
L:1/8
M:2/4
K:G
 D | GGGA | FEDD | GGAc | B2 z A | BBBA | Bc d2 | z AAG | ABcd | BBAA/A/ | G2 G2 | BdAA/A/ | G2 z |]  