Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/16
M:4/4
K:C
['B2E2A2 |[M:2/4][K:G]SOSOO .!fermata!PMTuC2O(Mdc) BGDG B2cB A^GAB c2(BA)', 'dgfg edBd ea^ga']  
X:1
L:1/16
M:4/4
K:C
 B2E2A2 |[M:2/4][K:G]SOSOO .!fermata!PMTuC2O(Mdc) | BGDG B2cB | A^GAB c2(BA) | Bgdg BgdB | 
 c2A2 A2(dc) | BGDG B2(cB) | A^GAB c2d2 | egdg BgAc | B2G2 G2 :: (Bc) | dgfg edBd | ea^ga e2(ga) | 
 bagf gedB | c2A2 A2(Bc) | dgfg edBd | ea^ga e2d2 | egdg BgAc | B2G2 G2 :|  