Develop a musical piece by utilizing the alphabet-based notation of the selected musical form and the provided melodic idea.
X:1
L:1/8
Q:1/4=120
M:4/4
K:Db
['A G F F']  
X:1
L:1/8
Q:1/4=120
M:4/4
K:Db
 A A B c B/ B/ A G F | F A B c B A3 | A A B c A G F | F D F E E D3 | D D3/2 D/ D2 A G F | 
 F D3/2 D/ D F E3 | E D3/2 D/ D D A G F | F D F E C D3 ||  