Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/4
M:2/2
K:G
['f d']  
X:1
L:1/4
M:2/2
K:G
 g |"D" f d d e/f/ |"G" g G G g |"D" f d d/e/f/d/ |"G" g3 a/g/ |"Bm" f d d e/f/ |"Em" g d"Am" d c | 
"G" B2"D7" A2 |"G" G3 :: c/B/ |"C" c e e d/c/ |"G" [BG]/[cA]/ [dB] [dB] c/B/ |"C" c e e d/c/ | 
"G" B d d B |"C" c/B/c/d/ e/d/e/f/ |"G" g d"Am" d c |"G" B2"D7" A2 |"G" G3 :|  