Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
Q:1/2=90
M:4/4
K:G
['G2 G2', 'Bc dBdg dBdg eceg eceg']  
X:1
L:1/8
Q:1/2=90
M:4/4
K:G
 DE/F/ | G2 G2 G2 Bc | dBdg dBAG | eccB dBAG | FGAB A2 DE/F/ | G2 G2 G2 Bc | dBdg dBAG | 
 edcB cBAG | D2 G2 G2 :: Bc | dBdg dBdg | eceg eceg | edcB cBAG | FGAB A2 Bc | dBdg dBdg | 
 eceg eceg | gfed cBAG | D2 G2 G2 :|  