Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:2/2
K:Amix
['e c3', 'fBBg a2 ea gbec dcBc defg a/b/a']  
X:1
L:1/8
M:2/2
K:Amix
 e c3 ecac | eccA Bcdf | e c3 ece=g |1 fdBc defa :|2 fdBc defg || a/b/a ea gbeg | afge fBBg | 
 a2 ea gbec | dcBc defg | a/b/a ea gbeg | afge fBBg | agfe fedc | Bcde fgaf ||  