Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:3/4
K:G
['DGB dd', 'BA GG']  
X:1
L:1/8
M:3/4
K:G
"G" DGB |:"G" dd dc BA | GG GB AG |"D7" AA Ac BA |1,3"G" GG GD GB :|2,4"G" G2- G z :| D2 |: 
"C" E2 G2 FE |"G" D2 B2 AG |"D7" F2 c2 BA |1,3"G" G2 B2 D2 :|2,4"G" G2- G z :|  