Create a musical composition that adheres to the provided structure and theme.
X:1
L:1/4
M:4/4
K:Bb
['G G']  
X:1
L:1/4
M:4/4
K:Bb
 G G G | B d d c | B2 z B | B A/G/ F B | A2 G2 | F2 z F | F E/D/ F B | G3/2 F/ G B | c B/A/ G F | 
 E2 D z | z |]  