Create musical pieces following the given structure and incorporating the suggested musical concept.
X:1
L:1/16
M:2/4
K:D
['D2>D2 DFEF DFAB A2Bc', 'a2>b2 agef gefd edBc'  
X:1
L:1/16
M:2/4
K:D
 A,2 | D2>D2 DFEF | DFAB A2Bc | dcdB AFDF | EFED B,2A,2 | D2>D2 DFEF | DFAB A2Bc | dfab ageg | 
 f2d2 d2 :: fg | a2>b2 agef | gefd edBc | dBBA B2ab | agef gefg | a2>b2 agef | gefd edBc | 
 dcdB AFDF | E2D2 D2 :|  