Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
M:4/4
K:G
['g3 a gaba', 'z2 B3 A B2 c2 d2 (e^c)']  
X:1
L:1/8
M:4/4
K:G
 d2 | g3 a gaba | (g4 d2) z d | e3 d e>fg>f | (e4 d2) z B | g3 a gaba | (edcB) !fermata!c2 (Bd) | 
 e2 (ge) (edcB) | (B3 A G2) z2 || B3 A B2 c2 | d2 (e^c) d2 (g>f) | edBd e>fg>f | (e4 d2) (ef) | 
 g2 g2 B3 d | (edcB) A2 B>c | d2 (ge) (edcB) | (B3 A G2) ||  