Craft a musical work adhering to the specified theme and structure.
X:1
L:1/4
M:4/4
K:G
['G F']  
X:1
L:1/4
M:4/4
K:G
 G F G/ E3/2 D/ | E F G2 | G F/G/ E3/2 D/ | E F G2 | z G G3/2 G/ | E/F/ G F3/2 E/ | E D G A B2 | 
 G A B2 | B A/G/ | A/G/ F G F | E c B A/G/ | A/G/ F G F | E4 |]  