Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:2/2
K:D
['df f2 dfed']  
X:1
L:1/8
M:2/2
K:D
"D" dABA dABA |"A/G" GAFA"G/A" EADA |"D" dABA dABA |"A" FA"^(G)"EA"D" D2 D2 ::"D" df f2 dfed | 
"A" cAce"^(G)" gece |"D" df f2 dfed |1"A" cA"^(G)"Bc"D" d2 d2 :|2"A" cA"^(G)"Bc"D" defg |] 
"D" aAgA fAeA |"A" Ae e2 Ae e2 |"D" aAgA"G" fAeA |"A" Addc"D" defg |"D" aA A2 aA A2 | 
"A" gA A2 gA A2 |"D" f2 af"G" gbag |"A" fdec"D" d4 |]  