Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:2/4
K:F
['cd cc/c/', 'Ff df df ec cc/d/ eA AA/c/']  
X:1
L:1/8
M:2/4
K:F
 c/c/ |"F" cd cc/c/ | cd cc/c/ | cd cf |"C7" Pfe ec/c/ | cd cc/c/ | cd cc/c/ | ce cg | 
"F" gf fc/c/ | cd cc/c/ | cd cc/c/ | cA f>e |"Bb" Ped dc/c/ |"C7" ce/f/ g/f/e/d/ | 
"F" c !>!f2 A/c/ |"C7" Be ed/e/ |"F" f3 f/g/ |:"F" !>!a2 !>!a2 | ac cc/=B/ | cA cf |"C7" e3 e/f/ | 
 !>!g2 !>!g2 | gc cd/=B/ | ce cd/e/ |1"F" f3 f/g/ :|2"F" f3 f |:[K:Bb]"Bb" df df |"F7" fc cc/d/ | 
 eA Ac |"Bb" BF Ff | df df |"Cm" ec cc/d/ |"F7" eA AA/c/ |1"Bb" B3 f :|2"Bb" B3 z |]  