Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:4/4
K:A
['e a2 e<a c>AA>a c<Ae>A c>AA>e =g2']  
X:1
L:1/8
M:4/4
K:A
 e | a2 e<a c>AA>a | c<Ae>A c>AA>e | =g2 f<g a>ef>d | B<=Gd>G B>GG ||  