Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/4
Q:1/4=100
M:5/4
K:Eb
['G c']  
X:1
L:1/4
Q:1/4=100
M:5/4
K:Eb
 G | c B c2 d |S e e d B c/ c/ | c c (G F) E | F F G2 G |"^a" c B c2 d |S e c d B B/ B/ | 
 c c (G F) E | F F G2 G/>F/ | E3/2 G/ (B =A) G | G c c2 c/d/ | e c f2 g/f/ | e d/c/ (G F) z | 
[M:3/4] E F =A | B2 E | D C ||"^variant a" c3/2 c/ c2 d ||  