Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
Q:1/8=160
M:6/8
K:C
['G/F/ EGc cBc Bdf fed', 'c2 c g^fg gag gfe f2 e']  
X:1
L:1/8
Q:1/8=160
M:6/8
K:C
 G/F/ | EGc cBc | Bdf fed | ecG AdB | cBA G2 G/F/ | EGc cBc | Bdf fed | gec AdB | c3 c2 :| c | 
 g^fg gag | gfe f2 e | def afd | c>dc B2 G | A>Bc fdc | B>cd e>fg | fdB GAB | c3 c2 :|  