Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
Q:3/8=100
M:6/8
K:D
['d2 D', 'd3 fed fed Bed cBA d2 D']  
X:1
L:1/8
Q:3/8=100
M:6/8
K:D
 d2 D FGA | Bed cBA | d2 D FGA | Be"^NB"c d3 :: fed fed | Bed cBA | d2 D EFG | Be"^NB"c d3 :|  