Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
Q:1/8=160
M:2/4
K:G
['D G2 A2 BA/B/ Gd/c/ B2', 'G3 B AG AB A3 G AB']  
X:1
L:1/8
Q:1/8=160
M:2/4
K:G
 D | G2 A2 | BA/B/ Gd/c/ | B2 A>G | G3 :| B | AG AB | A3 G | AB cB | A3 D | G2 A2 | BA/B/ Gd/ c/ | 
 B2 A>G | G3 ||  