Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/4
M:3/4
K:D
['F G', 'A d']  
X:1
L:1/4
M:3/4
K:D
 F/G/ | A2 G | F3/2 G/ A/F/ | G2 G/F/ | D A, D | G2 B | A B c | d A3/2 G/ | F D F | G E2 | F D2 | 
 A,2 ^A, | B,2 F | G F E | A A,2 | D3- | D2 :: A | d A2 | A d c | d G/A/ B/c/ | d A2 | 
 A/B/ c A/B/ | c F A | B D G/F/ | G F E | A,2 ^A, | B,2 F | G E2 | F D2 | G/A/ B G | A A,2 | D3- | 
 D2 :|  