Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
Q:1/8=180
M:6/8
K:G
['GBd gfg', 'G2 z BBB ccc dBG A2 G']  
X:1
L:1/8
Q:1/8=180
M:6/8
K:G
 D | GBd gfg | edc BAG | GBd gfg | fdd def | gfg fdB | cec dBG | GBd cAc | BGG G2 :: z | BBB ccc | 
 dBG A2 G | Bcd efg | fdd def | gfg fdB | cec dBG | GBd cAc | BGG G2 :|  