Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:4/4
K:Amin
['B A2', 'd2 e d2']  
X:1
L:1/8
M:4/4
K:Amin
|:"E" z E2 F ^G2 A2 | B3 c ^d2 cB | B8- | B8 | z E2 F ^G2 A2 | B3 c ^d2 cB | B8- | B8 | 
"Am" c B2 c B2 A2 | B A2 B A2 ^G2 |"E" ^G8- | G8 |"Dm" B A2 B A2 ^G2 | ^G F2 G F2 EE |"E" E8- | 
 E8 ::"Am" A8- | A6 ^GA |"G" B8- | B6 AB |"Cm" c6 Bc |"B" ^d6 cd |"E" e8- | e8 |"Dm" f e2 f e2 d2 | 
 e d2 e d2 c2 |"E" B8- | B8 |"Dm" d c2 d c2 B2 | B A2 B ^G2 F2 |"E" E8- | E8 :|"^Doda" | 
"Am" c6 Bc |"B" ^d6 cd |"E" e8- | e8- | e8- | e z7 |]  