Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
M:4/4
K:D
['FA d2 ce g2', 'fd (f/g/a) ec (e/f/g)', 'd2 FDGE AFBG gfed (c/d/e) Ag fdge']  
X:1
L:1/8
M:4/4
K:D
|: FA d2 ce g2 | fdcd e/d/c/B/ AG | FA d2 ce g2 | fdBc d2 d2 :: fd (f/g/a) ec (e/f/g) | 
 fdcd e/d/c/B/ A2 | fd (f/g/a) ec (e/f/g) | fd Bc d2 d2 :: FDGE AFBG | gfed (c/d/e) Ag | 
 fdge afbg | (f/g/a) Ac d2 d2 :|  