Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
M:2/2
K:G
['', 'dgfa (3gab gd (3efg dc (3Bcd', '(3Bdg (3bag (3fed']  
X:1
L:1/8
M:2/2
K:G
 Bc |: dgfa (3gab gd | (3efg dc (3Bcd BG | FGAB cBcg | (3aba (3gfe (3ded (3cBc | dgfa (3gab gd | 
 (3efg dc (3Bcd bg | fedB cAFA |1 G2 (3AGF G2 z2 :|2 G2 (3AGF G2 z2 |: (3cdc (3BAG (3FAc (3fed | 
 (3BdG (3Bdg (3bag (3fed | (3cdc (3BAG (3FAc (3fed | (3BdG (3Bdg (3bag (3fed | 
 e2 (3ceg (3c'ba (3gfe | d2 (3Bdg (3bag (3fed | (3cdc (3BAg (3fed (3cBA | (3GBd (3gdB G2 z2 :|  