Develop a musical creation based on the specified alphabetical structure and given motif.
X:1
L:1/4
M:6/4
K:D
['A B3/2 c/ d c3/2 B/ A', 'A F2']  
X:1
L:1/4
M:6/4
K:D
 A | B3/2 c/ d c3/2 B/ A | d2 B A F2 | E3- E2 A | B3/2 c/ d c3/2 B/ A | d2 B A F2 | D3- D2 :: 
 (A/4B/4)c/ | B2 G A F2 | B2 G A F2 | E3- E2 (A/4B/4)c/ | B2 G A F2 | d2 B A F2 | D3- D2 |]  