Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:2/2
K:A
['', 'cAec Bcde', 'faec dfec A2', 'A EAcA EAcA GABc defg |1 aaga']  
X:1
L:1/8
M:2/2
K:A
 e=g^g |: aAAA cAec | Bcde fefg | aAAA cAeA | fAgA a2 (3efg | aAce aece | Bcde fefg |1 aaga faec | 
 dfec Ac(3efg :|2 afge faec | dfec A2 ed |: cAEA cAec | Bcde f2 ed | cAEA Acec | dfec dBBd | 
 cAEA Acec | Bcde fefg |1 aaga faec | dfec A2 ed :|2 afge faec | dfec A2 z A |: EAcA EAcA | 
 GABc dBBA | GBEB GBEB | GBEB A3 A | EAcA EAcA | GABc defg |1 aaga faec | dfec AzA z :|2 
 abga faec | dBGB A2 z2 |]  