Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
M:2/4
K:G
['', 'dB/d/ ed', 'dg/d/ Bd']  
X:1
L:1/8
M:2/4
K:G
 B |: dB/d/ ed | B2 GB | dB/d/ ed | F4 | A>B cd | [fc]2 [fc]>e | e>d dc | B2 G2 | dB/d/ ed | 
 B2 GB | dB/d/ ed | F4 | A>B cd | [fc]2 [fc]>e | d>c AF |1 [GB,]3 B :|2 [GB,]2 g2 |: eg/e/ ce | 
 eg/e/ ce | dg/d/ Bd | dg/d/ Bd | A>B cd | [fd]2 [fd]>e | e>d dc | [BD]3 g | eg/e/ ce | eg/e/ ce | 
 dg/d/ Bd | dg/d/ Bd | A>B cd | [fc]2 [fc]>e | d>c AF |1 [GB,]3 g :|2 [GB,]3 |]  