Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/16
M:2/4
K:G
['GB d2 e/d/c/B/', 'GB c/B/A/B/', 'Bdg2 g/f/e/d/', 'GB c/B/A/B/']  
X:1
L:1/16
M:2/4
K:G
 GB d2 e/d/c/B/ d2 | GB d2 e/d/c/B/ A2 | GB d2 e/d/c/B/ d2 | gedB AccB :: GB c/B/A/B/ GB c/B/A/B/ | 
 GB c/B/A/B/ cAAB | GB c/B/A/B/ GB c/B/A/B/ | edB cAAB :: Bdg2 g/f/e/d/ g2 | Bdg2 g/f/e/d/ gb | 
 Bdg2 g/f/e/d/ g2 | gedB cAAB :: GB c/B/A/B/ c/B/A/B/ | GB c/B/A/B/ cAAB | GB c/B/A/B/ c/B/A/B/ | 
 gedB cAAB :|  