Create musical pieces following the given structure and incorporating the suggested musical concept.
X:1
L:1/8
M:4/4
K:D
['d2 AG', 'fgaf defd'  
X:1
L:1/8
M:4/4
K:D
 d2 AG FDEF | G2 A,B, CEAc | d2 AG FGAc | B^deg fdec | d2 AG FDEF | G2 A,B, CEAc | dcdA BcdB |1 
 AFGE FD D2 :|2 AFGE FDDg || fgaf defd | Beed cAAg | fgaf defd | Beec d3 e | fgaf defd | 
 Beed cABc | dfeg fagb | afge d3 e :|  