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:Bb
['DF F2 EG G2']  
X:1
L:1/8
M:2/4
K:Bb
 F | d2 z B | F2 z F | FFGD | F2 E2 | c3 B | AGFE | D2 z2 | DF F2 | EG G2 | FAcc/c/ | dB F2 | 
 DF F2 | EG G2 | FAcc | B2 z |]  