Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:4/4
K:E
['BEEc B2', 'fc (3ccc']  
X:1
L:1/8
M:4/4
K:E
|: BEEc B2 Bc | BEGB cBce | BEEc B2 GB | cBce fgec | BEEc B2 Bc | BEGB cBce | fgfe cefg |1 
 eccB ceec :|2 eccB ceef |: gB (3BBB g2 fe | fc (3ccc f2 fg | fc (3ccc c2 Bc | eB (3BBB Bcef | 
 gB (3BBB g2 fe | fc (3ccc f3 e | fgfe cefg |1 eccB ceef :|2 eccB ceec ||  