Create musical pieces following the given structure and incorporating the suggested musical concept.
X:1
L:1/8
M:2/2
K:G
['Bc dg (3fga gdBA GFGA BGDC B,DGF', '', 'ABde fgfd cdef gbag fagf (3efe (3dcB'  
X:1
L:1/8
M:2/2
K:G
 Bc | dg (3fga gdBA | GFGA BGDC | B,DGF EGcB | ADFA d2 Bc | dg (3fga gdBA | GFGA BGDC | 
 B,DGF EGcB | ADFA G2 :|[K:D] FG |: ABAF ABde | fgfd cdef | gbag fagf | (3efe (3dcB A2 FG | 
 ABAF ABde | f3 d (3Bcd ef | gf (3efg fedc |1 dfec dAFG :|2 dfec dc ||  