Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
M:2/2
K:Amin
['e>AA>B e>AA<g BGG>A B>AGB c>AAB e>AA<e B<GG>A', 'A2 a>ge>a g>e g2 e>dg>d e>de<a a>gea', 'A>aB>a c>a']  
X:1
L:1/8
M:2/2
K:Amin
 e>AA>B e>AA<g | BGG>A B>AGB | c>AAB e>AA<e | B<GG>A B>A A2 :: a>ge>a g>e g2 | e>dg>d e>de<a | 
 a>gea g<e Tg2 | B<G-G>A B<A A2 :: A>aB>a c>a Te2 | d>eB>e d<GG>B | A>aB>a c>a e2 | 
 B<GG>A B<A A2 :|  