Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:4/4
K:C
["G2 c2 c>e d2 d>f e2 c'b", 'c2 G2 gagf e2 e2 fgfe{e} d4']  
X:1
L:1/8
M:4/4
K:C
 G2 | c2 c>e d2 d>f | e2 c'b a2 g2 | e2 (3gec d2 (3gec | c2 c2 c2 :: G2 | gagf e2 e2 | fgfe{e} d4 | 
 Tgagf efef | gagf/e/{e} d2 TG2 | c2 ce d2 df | e2 c'a g2{a} g2 | e2 (3gec d2 (3fdB | c2 c2 c2 :|  