Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:2/4
K:D
['DE/F/ GB AD F2 AB/A/ GE', 'AB/c/ dc BA F2 AB/A/ GE']  
X:1
L:1/8
M:2/4
K:D
 DE/F/ GB | AD F2 | AB/A/ GE | DE FA | DE/F/ GB | AD F2 | AB/A/ GE | ED D2 :: AB/c/ dc | BA F2 | 
 AB/A/ GE | DE FA | AB/c/ dc | BA F2 | AB/A/ GE | ED D2 :|  