Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:2/4
K:Ador
['A>B AG', 'ed c>d']  
X:1
L:1/8
M:2/4
K:Ador
|: A>B AG | EF GE | A>B AG | Ad d/e/d/c/ | A>B AG | EF GE | AB cE | ED D2 :| ed c>d | ed c2 | 
 ed cd | ea a/b/a/g/ | ed c>d | ed c>B | AB cd | ef g/a/g/f/ | ed c>d | eA c2 | ed cd | 
 ea a/b/a/g/ | e/f/g d>B | ce d2 | AB cE | ED D2 ||  