Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:4/4
K:Emin
['E2 B2 B2 AB c3 B A2', 'EB, E2 F2']  
X:1
L:1/8
M:4/4
K:Emin
 E2 B2 B2 AB | c3 B A2 FG | A2 A2 B2 AG | FD EF G2 F2 | E2 B2 B2 AB | c3 B A2 FG | A2 A2 B2 AG | 
 FD EF E2 ED :| EB, E2 F2 GF | EB, E2 F2 G2 | A2 A2 B2 AG | FD EF G2 F2 | EB, E2 F2 GF | 
 EB, E2 F2 G2 | A2 A2 B2 AG | FD DF E2 ED :|  