Develop a melodic piece adhering to the specified musical form.
'Sectional: Through Composed'  
X:1
L:1/8
M:2/4
K:none
[K:G] d/d/ |: dB Bd/d/ | d"_c"c cd/d/ | dd ef | ag gd/d/ | dB Bd/d/ | eA Ae/e/ | ed f/e/"_c"c/A/ |1 
 GG Gd/d/ :|2 GG G z |:[K:D] A/B/c/d/"_=" eg | f2 z d/f/ | e2 z c/e/ | d2 d/e/d/B/ | A/B/c/d/ eg | 
 f2 z d/f/ | e2 z c/e/ |1 dd d z :|2 dd dd/"_>Teil A" d/ |:[K:C] GE GE | G3 A/G/ |"_f" FF FG/F/ | 
 EG/G/ GG | GE GE | .G2"_c" !>!c2 |1 B>A G"_f"F | .E2 !>!G2 :|2 Bg/g/ g/"_f"f/e/d/ |"_c" cc c z |]  