Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
Q:1/4=110
M:2/4
K:A
['a=g eg', 'e2 d/A/c AA/B/']  
X:1
L:1/8
Q:1/4=110
M:2/4
K:A
|:"A" a=g eg | e/d/c Aa- | a=g eg | a>b aa- | a=g eg | e/d/c AA/B/ | ce"E" e d d/c |"A" A2 A2 :: 
"A" e2 e2 | d/A/c AA/B/ | ce"D" dA/B/ |"A" ce d/c/A |"A" e2 e2 | d/A/c AA/B/ | ce"E" e/d/c | 
"A" A2 A2 :|  