Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
M:4/4
K:D
['a2 ag fdde', 'AEAB =c2 cd e2']  
X:1
L:1/8
M:4/4
K:D
 a2 ag fdde | fdad fdfg | a2 ag fdde | fded cA A2 | a2 ag fdde | fdad fd d2 | c3 d efge | 
 aged cA A2 :| AEAB =c2 cd | e2 d=c BG G2 | AEAB =c2 cd | e2 ed ea a2 | AEAB =c2 cd | 
 e2 d=c BG G2 | F3 G AB=cA | d=cAG FD D2 :|  