Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:6/8
K:F
['c=Bc Aag', 'f2) [gG]3 [eG][dF][cE] [cAD]=BB [B=B,]B/c/d/e/ [fG]3 fed', 'c2 [K:Bb] F bfd BFD B,DF Bdf']  
X:1
L:1/8
M:6/8
K:F
 A/B/ | c=Bc Aag | .f.e.d .c.B.A | GAB Ggf | .e.d.c .B.A.G | c=Bc Aag | fed cBA | BAB Bge | 
 (g3 f2) |] !fermata!e/f/ | [gG]3 [eG][dF][cE] | [cAD]=BB [B=B,]B/c/d/e/ | [fG]3 fed | 
 [gC]2{E} [eE] [cE]/B/c/d/e/f/ | [gG]3 [gG][fF][dE] | [dA]cd [fd]ga | [gc]ec BgB | d3"^D.C." c2 |] 
[K:Bb] F | bfd BFD | B,DF Bdf | c'fd Bcd | c=ef _ecA | dBA GEC | A,CF Acf | ecA FGA | 
 Bdc"^D.C." B2 |]  