Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:3/4
K:G
['g2 ge dB', "b2 ba bd'"]  
X:1
L:1/8
M:3/4
K:G
 g2 ge dB | Aa ag fd | g2 ge dB | dg gf g2 | g2 ge dB | Aa ag fd | g2 ge dB | dg gf g2 || 
 b2 ba bd' | a2 ag fa | b2 ba bd' | dg gf g2 | b2 ba bd' | a2 ag fa | b2 ba bd' | dg gf g2 ||  