Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:6/8
K:Amix
['A2 A A>Bc A>ce f>ec', 'f2 f', 'A2 A c>BA c>eA', 'A2 A']  
X:1
L:1/8
M:6/8
K:Amix
 e | A2 A A>Bc | A>ce f>ec | B2 B B>cA | B>ce f>ga | A2 A A>Bc | A>ce f>ec | f>af e>Bc | A2 A A2 :: 
 e | f2 f f>ga | f2 f f2 c | e2 e e>ga | e2 e e2 B | c2 c c>BA | A2 A B>ce | f>af e>Bc | A2 A A2 :: 
 e | A2 A c>BA | c>eA c>BA | B2 B B>ce | f>ga f>ec | A2 A c>BA | c>eA c2 e | f>af e>Bc | A2 A A2 :: 
 g | a>ff f>ef | f<af f>ec | f>ee e>ce | f>ec e>cB | c>BA A2 A | B>ce f2 e | f>af e>Bc | A2 A A2 :|  