Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/4
M:2/2
K:F
['(B A) G F', 'd) (d c)']  
X:1
L:1/4
M:2/2
K:F
|: f2 F f | e3 d | B G E c | A3 A | A d d c | =B3 g | c3/2 d/ d3/2 c/ | c3 f | (f e) (e d) | 
 (d c) (c B) | (B A) G F | E3 A | (A d) (d c) | (B A) G F | E F (F/4G/4A/) (G/F/) | F4 :| 
 c2 G (G/4A/4B/) | A3 e | f d g e | ^c3 a | (a g) b a | (g f) (e d) | ^c d (d/4e/4f/) (e/d/) | 
 d3 f | (f e) (e d) | (d c) (c B) | (B A) (G F) | E3 A | (A d) (d c) | (B A) G F | 
 E F (F/4G/4A/) (G/F/) | F4 |]  