Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
M:6/8
K:D
['d3 d3 dcB ABc dcB AGF G2', 'fed e A2', 'dfa dfa']  
X:1
L:1/8
M:6/8
K:D
|: d3 d3 | dcB ABc | dcB AGF | G2 F E2 D | e3 e3 | fed eag | fef d2 A | def e2 d :: fed e A2 | 
 fed e A2 | gfe f B2 | gfe f B2 | fed e A2 | fed eag | fef d2 A | def e2 d :: dfa dfa | dfa afd | 
 egb egb | egb bge | dfa dfa | dfa a2 g | fed d2 A | def e2 d :|  