Construct melodies utilizing the provided motif and adhere to the outlined musical structure.
X:1
L:1/8
M:4/4
K:C
['(A G)']  
X:1
L:1/8
M:4/4
K:C
 z6 z G | c3/2 c/ c3/2 d/ c B B c | (A G) A _B (A G) E A | (G F) (E D) (C D) E G | 
 A2 (B3/2 c/) c2 G | c2 c3/2 d/ (c B) A B | (A G) A _B (A G) E A | (G F) (E D) (C D) E G | 
 A2 (B3/2 c/) c2 G | c2 c3/2 d/ e3 e | f e (d c) (e c) A B | c2 e3/2 c/ (c B) B c | 
 (A G) A _B (A G) E c/ e/ | g3/2 f/ e d c B B c | (A G) A _B (A G) E A | (G F) (E D) (C D) E G | 
 A2 (B3/2 c/) c2 z2 |]  