Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
M:12/8
K:D
['F2 D', 'ecA GFE D3']  
X:1
L:1/8
M:12/8
K:D
|: F2 D FGA F2 D FAF | E3 EFG E2 D E2 A | F2 D FGA F2 D FAF |1 E3 GFE D3 D2 E :|2 E3 GFE D3 B2 c |: 
 d3 A3 dcd A2 B | cBc E3 cBc E3 | d3 ABc d2 e fed |1 ecA GFE D3 B2 c :|2 ecA GFE D3 D2 E ||  