Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
Q:1/4=100
M:2/4
K:A
['A2 B c/B/c/d/ ed c A2']  
X:1
L:1/8
Q:1/4=100
M:2/4
K:A
 e A2 B | c/B/c/d/ ed | c A2 B | c/B/c/d/ ed | c A2 ^d- | df-fa | gf/e/ B^d | e4 |:  