Compose a musical piece in accordance with the outlined theme and structure.
X:1
L:1/4
M:4/4
K:G
['B c d']  
X:1
L:1/4
M:4/4
K:G
 G3/2 A/ B c | d B/A/ G2 | g g f f | e e d2 | g3/2 f/ e g/e/ | d3/2 c/c/B/ B | e d c B | 
 A d/c/B/A/ G | G A B c | d e/f/ g2 | d g e d/c/ | B A G2 |]  