Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
M:6/8
K:D
['ABG FED', 'd2 g afd gfe dcd AFA DFA']  
X:1
L:1/8
M:6/8
K:D
|: B | AFD D2 B | ABG FED | FAd fed | cAA A2 G | ABG FED | BdB AFA | dfa gfe | fdc d2 :: g | 
 afd gfe | dcd AFA | DFA def | gfg efg | afd edc | dAG FGA | dfa gfe | fdc d2 :|  