Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:4/4
K:D
['DA,FD AFdA cbag']  
X:1
L:1/8
M:4/4
K:D
 (FE) |"D" DA,FD AFdA |"G" Bged"A" cbag |"D" fedc"G" Bged |"A" (3(cdc) (3(BcB) AGFE | 
"D" DA,FD AFdA |"G" Bged"A" cbag |"D" fedc"A" Bgec |"D" d2"^(A)" dc"D" d2 :: (fg) | 
"D" a^gaf def=g |"G" bagf"A" eAce |"G" gfge"A" cdef |"G" (3(gag) (3(fgf)"A" egfe | 
"D" df"^(A)"ec"D" dDFA |"G" Bged"A" cbag |"D" fedc"A" Bgec |"D" d2"^(A)" dc"D" d2 :|  