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
['FDFA d2 fd']  
X:1
L:1/8
M:4/4
K:D
|:"D" FDFA d2 fd | d2 fd"A" ecAG |"D" FDFA d2 fd | dcAF"G" G2 AG |"D" FDFA d2 fd | d2 fd"A" ecAG | 
"D" FDFA d2 fd | dcAF"G" G2 de |:"D" f3 f"G" g2 fg |"D" abag fdde |"D" f3 f"G" g2 fg | 
"D" abaf"G" g2 fg |"D" agfa"G" gfeg |"D" fedf"A" ecAG |"D" FDFA d2 fd | dcAF |1"G" G2 de :|2 
"G" G4 |]  