Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:4/4
K:A
['(cd) (3(eae)(3(cec)(3(Aca)ED (CE)Ac e(cAc) (3(dfd)(3(cec)(3(BdB)(3(AcA) GBFB E2', 'A2 (Bc) dBGB E(GBc) d(BGB) d2 (cd)']  
X:1
L:1/8
M:4/4
K:A
 (cd) | (3(eae)(3(cec)(3(Aca)ED | (CE)Ac e(cAc) | (3(dfd)(3(cec)(3(BdB)(3(AcA) | GBFB E2 (cd) | 
 (e>a)c>e (A>c)E>D | C(EAc) e(cAc) | (3(dfd) (3(cec) (3(BdB) (3(GBG) | A(aec) A2 :: (Bc) | 
 dBGB E(GBc) | d(BGB) d2 (cd) | ec (3(AcA) (EA)cd | ec (3Ace a2 ga | f(dBd) (3(fed) (3(cBA) | 
 (3(GAB) (3(AGF) E2 (cd) | eaf(d cA)BG | A(aec) A2 :|  