Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
M:3/4
K:Bb
['c2 B2']  
X:1
L:1/8
M:3/4
K:Bb
 F2 | B2 d2 c2 | B2 F2 D2 | F2 G2 (FE) | D4 D D | (E3 G) A B | c2 c2 B2 | A2 A2 G2 | F4 A B | 
 c2 c2 c2 | f2 =e2 d2 | c2 c2 B2 | A4 A2 | B2 c2 B2 | B3 F F2 | G B3 G2 | F4 G A | B3 F D F | 
 B,4 Bc | d2 (cB) G B | F4 G A | B F3 D2 | E e3 d2 | c3 B A2 | B6 |]  