Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
M:4/4
K:Dmix
['DAAG ABcA', 'defd cAAc']  
X:1
L:1/8
M:4/4
K:Dmix
 C | DAAG ABcA | GE E2 cEGE | DAAG ABcA | BcAG FDD :| A | defd cAAc | BGGB cA A2 | defd cAAc | 
 BcAG FDD :|  