Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:4/4
K:C
['.abc ||[M:9/8][K:Emin] (3TEFE E2 F', 'EFE E2', 'E2 B- TB2', 'd B2 e- e2 a fdB', 'BdB ABA TG2']  
X:1
L:1/8
M:4/4
K:C
 .abc ||[M:9/8][K:Emin] (3TEFE E2 F G2 F | EFE E2 B AFD | EFE E2 F G2 B | AFA dAG FED :| 
 E2 B- TB2 F G2 F | E2 B- TB2 GAFD | E2 B- TB2 F G2 B | AFA dAG FED | E2 B- TB2 F G2 F | 
 E2 B- TB2 G AFD | E2 B AB^c dcB | AFA dAG FED || B2 e (e/f/ed) e2 d | B2 e- e2 a fdB | 
 A2 d- d2 ^c d2 B | A2 e d2 B AFD | B2 e (e/f/ed) e2 d | B2 e- e2 a fdB | fgaefg d2 A | 
 B2 ^c A2 G FED || BdB ABA TG2 F | EFE TE2 B AFD | BdB ABA TG2 B | AFA dAG FED | BdB ABA TG2 F | 
 EFE TG2 FAFD | B^cd ABc dcB | AFA dAG FED |]  