Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
Q:1/2=112
M:4/4
K:D
['d2 dA BAFA ABdA BAFA ABde', '', 'a2 ag f2 fe d2 dA BAFA']  
X:1
L:1/8
Q:1/2=112
M:4/4
K:D
 A2 | d2 dA BAFA | ABdA BAFA | ABde f2 ed | Beed egfe | d2 dA BAFA | ABdA BAFA | ABde fdec | 
 dBAF D2 :| fg |: a2 ag f2 fe | d2 dA BAFA | ABde f2 ed | Beed egfg | a2 ag f2 fe | d2 dA BAFA | 
 ABde fdec | dBAF D4 :|  