Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:6/8
K:A
['e2 f', 'aec aec', 'AAA ecc', 'AAA acc ecc']  
X:1
L:1/8
M:6/8
K:A
|: AAA e2 f | ecc e2 f | AAA e2 f | ecc c2 B | AAA e2 f | ecc e2 f | AAA d2 f | ecc c2 B :: 
 Ace aec | aec aec | Ace aec | aec c2 B | Ace aec | aec aec | AAA d2 f | ecc c2 B :: AAA ecc | 
 fdd ecc | AAA ecc | ecc c2 B | AAA ecc | fdd ecc | AAA d2 f | ecc c2 B :: AAA acc | ecc acc | 
 AAA acc | ecc c2 B | AAA acc | ecc acc | AAA d2 f | ecc c2 B :|  