Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/16
M:2/4
K:C
['(3dcB cec2a', 'fgad gabd', '', '', 'd [fa]c[fa]d [gb]d[gb]d ac2 afa']  
X:1
L:1/16
M:2/4
K:C
 (3dcB | cec2a gecd | eged e2{f}ed | cec2a gece | dfdB c2 (3dcB | cec2a gecd | eged e2 (3dcB | 
 cec2a gece | dfdB c2 ||[K:G] de | fgad gabd | abc2a bd2bg | fgad gabd | ac2af g2g2 | 
 [fa]2[fa]d [gb]2[gb]d | [ac]2ac2 |] d [bd]2bd2 |] dbd2 |] d | [fa]c[fa]d [gb]d[gb]d | ac2 |] 
 afa g2 ||  