Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:4/4
K:D
['', 'F>A d/f9/4', 'f>d A/f9/4 ge/ A>g f<ad<a c/A9/4 Ag/']  
X:1
L:1/8
M:4/4
K:D
 BG |: F>A d/f9/4 GB/ e/g | F3 A/ d<f e/A9/4 Ag/ | F>A d/f9/4 GB/ e/g | A3 e/ d/c/B/A/ d2 d7/4G/4 | 
 F>A d/f9/4 GB/ e/g | F3 A/ d<f e/A9/4 Ag/ | F>A d/f9/4 Be/ g<b | g<e d/c/B/A/ d2 d7/4g/4 || 
[K:Dmin] f>d A/f9/4 ge/ A>g | f<ad<a c/A9/4 Ag/ | F>A d/f9/4 Be/ g<b | g>e G/A/^c/e/ f/d21/8 de/4 | 
 f>d A/f9/4 ge/ A>g | f<ad<a c/A9/4 Ag/ | F>A d/f9/4 Be/ g<b | A>e d/^c/B/A/ d2 d7/4g/4 :|  