Construct melodies utilizing the provided motif and adhere to the outlined musical structure.
X:1
L:1/8
Q:1/4=100
M:4/4
K:Bb
['e2 d2 c2']  
X:1
L:1/8
Q:1/4=100
M:4/4
K:Bb
 F2 | B3 B (BA) (Bc) | B3 B e2 e2 | d2 c2 B2 c2 | A4 z2 F2 | d2 B2 A2 c2 | F2 (GA) B2 z B | 
 A2 B2 G3 F | F6 F2 | f2 e2 d2 c2 | =B2 c2 d2 z G | e2 d2 c2 B2 | A4 z2 F2 | F2 (GF) F2 (GA) | 
 (Bc) (de) f2 (ed) | (dc) (de) (BA) (GA) | B6 |]  