Create musical pieces following the given structure and incorporating the suggested musical concept.
X:1
L:1/8
M:2/2
K:G
['G>B dB gBdB', 'gage abaf'  
X:1
L:1/8
M:2/2
K:G
 B | G>B dB gBdB | gBdB aAAB | G>B dB gBdB | cAdc BGG :| f | gage abaf | gage beef | gage abaf | 
 gdec BGGf | gage abaf | gage beef | gage abaf | gdec BGG ||  