Construct a musical composition utilizing the provided motif and conforming to the specified structure.
X:1
L:1/8
Q:1/8=80
M:3/4
K:G
['G>A B2', 'd>B g2'  
X:1
L:1/8
Q:1/8=80
M:3/4
K:G
"^slow with expression" G>A | B2 g2 e>d | d B3 G>A | B2 cB A>G | G4 G>A | B2 g2 e>d | d B3 G>A | 
 B2 c>B A>G | G4 || d>B | g2 g>f e>d | d2 B2 d>B | g2 gfe^d | e2 g2 G>A | B2 g2 e>d | d B3 G>A | 
 B2 c>B A>G | G6 |]  