Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:2/4
K:D
['[Fd][Fd][Ec][Fd] [ce][df]', '[FAd] A FA/G/ FA GB TBA/B/ ^GB[Be][Bd]']  
X:1
L:1/8
M:2/4
K:D
 A | [Fd][Fd][Ec][Fd] | [ce][df] [Fd]2 | [ce]/d/e/f/ [Ag][Af] | e/d/c/B/ AA | [Fd][Fd][Ec][Fd] | 
 [ce][df] [Fe]2 | c/d/e/f/ g/e/d/c/ | [FAd]2 [FAd] :: A | FA/G/ FA | GB TBA/B/ | ^GB[Be][Bd] | 
 cB/c/ AG | FA d/e/d/=c/ | Bbag | [Af][Ge][Fd][Ec] | [FAd]2 [FAd] :|  