Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
Q:1/8=180
M:6/8
K:A
['', 'C/B,/ A,>CE ECE FEF A2 B']  
X:1
L:1/8
Q:1/8=180
M:6/8
K:A
 C/B,/ |: A,>CE ECE | FEF A2 B | c2 A d2 c | BB,B, B,2 C/B,/ | A,>CE ECE | FEF A2 B | c2 A d2 B |1 
 cAA A2 C/B,/ :|2 cAA A2 c/d/ | e>fe ece | agf ecA | d/e/fd ecA ||1 GBB B2 c/d/ | e>fe ece | 
 agf ecA | dcd Bed | cAA A2 c/d/ :|2 GBB B2 C/B,/ | A,>CE ECE | FEF A2 B | A/B/cA B/c/dB | 
 cAA A2 ||  