Create music using the given musical theme and adhere to the outlined letter-based structure.
X:1
L:1/8
M:4/4
K:D
['FAAB AFED FAAB ABde fBBA', 'D4 faab afde fdad fd d2 efga']  
X:1
L:1/8
M:4/4
K:D
|: FAAB AFED | FAAB ABde | fBBA Bcde | fBBA BcdA | FAAB AFED | FAAB ABde | fBBA BcdB | AFEF D4 :: 
 faab afde | fdad fd d2 | efga beef | gebe gfeg | fgaf bfaf | defd e2 de | fBBA BcdB | AFEF D4 :|  