Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
Q:1/4=96
M:2/4
K:D
['FA A(G/F/) BA A(B/c/) dABG', 'df f(e/d/) ce e(d/c/)']  
X:1
L:1/8
Q:1/4=96
M:2/4
K:D
 FA A(G/F/) | BA A(B/c/) | dABG | FD D2 :| df f(e/d/) | ce e(d/c/) | d>ef>g | aA A2 | df f(e/d/) | 
 ce e(d/c/) | dABG | FD D2 :|  