Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
M:6/8
K:G
['G2 A GED E/F/GE ABd e2 g', 'g2 b']  
X:1
L:1/8
M:6/8
K:G
 G2 A GED | E/F/GE ABd | e2 g edB | Age dBA | GBA GED | E2 G AB/c/d | e/f/ge edB | AeG E2 :| 
 GA/B/c d3 | deB dBA | GG/A/B e3 | e/f/gf edB | GB/c/d g2 b | aef g2 b | age d2 G | A/B/cG E2 :|  