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
['A f2']  
X:1
L:1/8
M:4/4
K:Ddor
 A | f2 ed e3 A | f2 e>d d3 A | f2 ed e2 dc | d>c A4 Ac | d2 c>d eged | c2 A>G G2 GE | 
 A2 A>B c2 de | d>edc A3 ||  