Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
Q:1/4=120
M:2/4
K:D
['B A>FD>F E>FG>B A>FD>F Ad dc/B/ A>FD>F', 'Add A d>fe>g f>dc>A d>fe>g fa-af g>feg']  
X:1
L:1/8
Q:1/4=120
M:2/4
K:D
 B | A>FD>F | E>FG>B | A>FD>F | Ad dc/B/ | A>FD>F | E>FGA | AF D/E/F/G/ | Add :: A | d>fe>g | 
 f>dc>A | d>fe>g | fa-af | g>feg | f>dc>A | Bd e/d/c/B/ | Add :|  