Create musical pieces following the given structure and incorporating the suggested musical concept.
X:1
L:1/8
Q:3/8=180
M:6/8
K:Db
['B2 B', 'd2 d'  
X:1
L:1/8
Q:3/8=180
M:6/8
K:Db
 F | B2 B c2 d | c3- c2 c | =A2 A B2 c | B3- B2 B | e2 e e2 e | e3 c2 c | d2 d d2 d | d3 B2 F | 
 B2 B c2 d | c3 c2 c | =A2 A B2 c | B3- B2 B | e2 e d2 c | d3 Bcd | c3 =A3 | B6- | B2 z B2 c || 
[K:Bb] d2 d d2 d | ded c2 B | (c6 | A3) A2 B | c2 c c2 c | cdc B2 A | B6- | B2 z B2 c | d2 d d2 d | 
 ded c2 B | (c6 | A3) A2 B | c2 c c2 c | cdc B2 A | B6- | B2 z |]  