Produce music using the specified musical structure depicted in letters along with the provided musical theme.
X:1
L:1/8
Q:1/4=120
M:2/2
K:D
['AFAD FABG- GB A2 [FA]3', '(=f-f- f3) d ff gfec d2 c2', 'AdB[GB]- [GB]B A2 [FA]3']  
X:1
L:1/8
Q:1/4=120
M:2/2
K:D
"^Moderately Quick" AB | AFAD FABG- | GB A2 [FA]3 (e | f)afd e2 c2 | d3 d d4 |"^*" AFAD FABG- | 
 GB A2 [FA]3 (E | F)FA(F G2) E2 | D6 :: (=f-f- | f3) d ff gfec | d2 c2 A2 (=f-f- | f)afd e2 c2 | 
 d4 [df]2 (=f-f- | f3) d ff gfec | d2 c2 A2 A2- | ABcA (!slide!cB) A2 | [GB]3 [GB] [GB]2 :| 
"^Substitution""^*" AFAF AdB[GB]- | [GB]B A2 [FA]3 E ||  