Compose a musical piece in accordance with the outlined theme and structure.
X:1
L:1/4
Q:3/4=90
M:6/4
K:G
['B c2 B A B G', 'd d'  
X:1
L:1/4
Q:3/4=90
M:6/4
K:G
 d2 g f3/2 e/ d | e2 g d3/2 c/ B | c2 B A B G | A F3/2 E/ D3 | a2 a g/a/ b B | g2 g f/g/ a B | 
 c2 B A B G |1 A F2 G3 :|2 A F2 G2 |: g/a/ | b a g a g f | g f e d c B | e2 e e2 e/4f/4g/ | 
 f2 e e3 | d d d d c B | B A G F E D | a2 e f d g |1 e f2 g2 :|1 e f2 g3 |]  