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
M:4/4
K:G
['g2 gf g2']  
X:1
L:1/8
M:4/4
K:G
 g2 gf g2 gf | g2 ag fd d2 | g2 fg abag | fdcA BGBd | g2 fg a=ffe | =fgfd e3 ^c | d2 de fdcB | 
 AGFG AG G2 :|  