Compose a musical piece using the designated musical pattern's alphabetic representation and the assigned melodic theme.
X:1
L:1/8
M:2/2
K:D
['fg afge dfed cdec ABAG FA df', 'B2 B2']  
X:1
L:1/8
M:2/2
K:D
 fg | afge dfed | cdec ABAG | FA df gfed | (ce) A2 A2 fg | afge dfed | cdec ABAG | FA df gedc | 
 d2 d2 d2 :: cd | eAAA eAeA | fAAA fAfA | gfed dcBA | B2 B2 B2 AG | FA df [ae]cAG | FA df a2 gf | 
 babg fedc | d2 d2 d2 :|  