Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:2/2
K:A
['[A,E]2 [A,E]2 A,B,CD', 'e2 fgaf']  
X:1
L:1/8
M:2/2
K:A
 [A,E]2- | [A,E]2 [A,E]2 A,B,CD | [EA][FA][AA][AB] [AA]4 | [AB] [Ac]2 [Ac] [Ad]2 [Ac]2 | 
 BAGB AFEC | [A,E]2 [A,E]2 A,B,CD | [EA][FA] [AA]2 [AA]4 | [Ae]2 fg aecA | EGBG A2 :| (3efg | 
[M:3/4] a2 g2 (3fgf e2 fgaf |[M:2/2] e[Ae][ce][ce] [ce]2 eg | b2 e2 fgaf | edcB A2 (3efg | 
 a2 e2 fgaf | e[Ae][ce][ce] [ce]2 [ce][Be] | [ce]2 b2 gefg | a2 [ca]2 [ca]2 :|  