Compose a piece using the specified musical pattern based on the alphabet and the provided melodic theme.
X:1
L:1/8
M:12/8
K:D
['A2 G FED', 'f2 e d2 c']  
X:1
L:1/8
M:12/8
K:D
 A2 G FED F2 G A3 | d3 cBA B2 G E3 | A2 G FED EFG A3 | Bcd e2 d cBc d3 :| f3 f2 e d2 c B3 | 
 e3 e2 d cdB A3 | f2 f f2 e d2 c Bcd | e3 efd ABc d3 :|  