Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
Q:1/4=120
M:2/2
K:G
['B/c/ d>edB d>edc B>dgB B>A AB/c/ d>ed>c', 'BGG d B>dg>b g>bg>d e>gd>B c>AA>c B>dg>b']  
X:1
L:1/8
Q:1/4=120
M:2/2
K:G
 B/c/ | d>edB d>edc | B>dgB B>A AB/c/ | d>ed>c B>dg>b | g>ed>c BGG :| d | B>dg>b g>bg>d | 
 e>gd>B c>AA>c | B>dg>b g>bgd | e>gdc Bggd | B>dg>b B>dg>b | dgab aA AB/c/ | de de/f/ gaba | 
 g>ed>c BGG |]  