Develop a musical composition in line with the given structure and theme.
X:1
L:1/8
Q:1/8=180
M:4/4
K:G
['B2 AB', 'z Bdef g2 ed'  
X:1
L:1/8
Q:1/8=180
M:4/4
K:G
 B2 AB GEDE | G2 BG dGBd | B2 AB GE D2 | EA A2 EA A2 | B2 AB GEDE | G2 BG dGBd | B2 AB GEDG | 
 EGGF G3 z :| Bdef g2 ed | eaab aged | Bdef ge d2 | eaag a3 z | Bdef g2 ed | ea a2 aged | 
 B2 AB GEDG | EGGF G3 z :|  