Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:4/4
K:D
['GEFD E3', 'dBBB AFAB dcde faba fedB Beef g2', 'dBBB AFAB dcde faba fedB Beef g2']  
X:1
L:1/8
M:4/4
K:D
 B,EEE E2 FA | B2 BA BdAG | FB,B,B, DEFG | AdBA GEFD | B,EEF G2 EF | GEFE DEFA | d2 fe dBAF |1 
 GEFD E3 D :|2 GEFD E3 d || Beef g2 ge | fafe dBBB | AFAB dcde | faba fedB | Beef g2 eg | 
 fAfe dBBc | d3 B =c2 BA | GEFD E3 d || B2 ed B2 ge | fgfe dBBB | AFAB dcde | faba fedB | 
 Beef g2 eg | fAfe dBBc | d3 B =c2 BA | GEFD E4 ||  