Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:4/4
K:Ddor
['DAAD cDdA']  
X:1
L:1/8
M:4/4
K:Ddor
"Dm" DAAD cDdA |"C" AGAG EcGE |"Dm" DAAD cDdA |"C" AGAc"Dm" d4 | DAAD cDdA |"C" AGAG EcGE | 
"Dm" DA (3AAA"C" GEcE |1"Am" EGGE"Dm" D4 :|2"C" EGGE D2"Dm" Ac ||"Dm" dcAA AGAc | ecAA AGAc | 
"C" dcAA AGAc | G2 Ec G2 Ec |"Dm" dcAA AGAc | ecAA AGAc |"C" cddc AGcG |1"Am" EGGE"Dm" D2 Ac :|2 
"Am" EGGE"Dm" D4 ||  