Compose a piece using the specified musical pattern based on the alphabet and the provided melodic theme.
X:1
L:1/8
M:4/4
K:D
['', 'dc cB BA BA FB AF BF', 'dBAG FD']  
X:1
L:1/8
M:4/4
K:D
 dc |: cB BA BA FB | AF BF AF FB | ABdB Adfd | efdf e B3 | d2 cd BAFB | AFBF AFFB | ABde faec |1 
 dBAG FDdc :|2 dBAG FD ag |: faag f2 fe | dfed BAFB | ABdB Adfd | e2 df e B3 | a2 ga fg ef | 
 dfed BAFB | ABde faec |1 dBAG FD ag :|2 dBAG FD D2 ||  