Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:3/4
K:Bb
['D FB', 'A,C CA GF', 'FF f3', 'BD FB']  
X:1
L:1/8
M:3/4
K:Bb
"^A""^getragen" FF | d3 c BG | F3 D FB | A3 E FA | E4 FF | e3 c AG | F3 E Fc | B3 D FB | D4 FF | 
 d3 c BG | F3 D FB | A3 E FA | E4 FF | f3 e cA | F2 EF Ac | (B6 | B2) z2 || 
[M:3/4]"^B""^zA 1/4 gig, froh" !fermata!D !fermata!C !fermata!B, | A,C CA GF | A,C CA GF | B,D DB GF | 
 B z BG FB, | A,C CA GF | A4 Fe |"^rit." d3 c BG | F3 !fermata!D !fermata!C!fermata!B, | 
 A,C CA GF | A,C CA GF | B,D DB GF | B z BG FB, | A,C CA GF | A2 G2 A2 | (B6 | B2) z || 
[M:3/4]"^C" FF | f3 d BG | F3 D FB | A3 E FA | E4 FF | f3 e cA | F3 E Fc | B3 D FB | D4 FF | 
 f3 d BG | F3 D FB | A3 E FA | E4 FF | f3 e cA | F2 EF Ac | (B6 | B2) z2 ||[M:3/4]"^D" FF | 
 d z dc BG | F2 BD FB | A z AE FA | E4 FF | e z ec AG | F2 AE Fc | B z BD FB | D4 FF | d z dc BG | 
 F2 BD FB | A z AE FA | E4 FF |"^rit." e3 c AG | F2 !fermata!d2 !fermata!c2 | (B6 | B2) z2 |]  