Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:2/2
K:Bb
['(([Ae] [Bf]2)) fg fdcA BABc dBGB FccF', 'FGFD B,CDB, C2 a2', '(3[FB][FB][FB] [FB]2']  
X:1
L:1/8
M:2/2
K:Bb
 (([Ae] | [Bf]2)) fg fdcA | BABc dBGB | FccF DFcF | ABcA F2 (([Ae] | [Bf]2)) fg fdcA | BABc dBGB | 
 FccF DFcA | [FB]3 [FB] [FB]2 :| DE | FGFD B,CDB, | C2 a2 a2 a2- | ageg fcAc | BcBA FD B,2 | 
 FGFD B,CDB, | C2 a2 a4 | ageg fcAc | [FB]3 [FB] [FB]2 |: [FB]2- | 
 (3[FB][FB][FB] [FB]2 (3[FB][FB][FB] [FB]2 | bfaf gfdB | (3F[FA][FA] [FA]2 (3F[FA][FA] [FA]2 | 
 AFAB cAFA | (3[FB][FB][FB] [FB]2 (3[FB][FB][FB] [FB]2 | bfaf gfdB | AffA f2 A2 | fefg fdcB | 
 AffA f2 A2 | fefg fdcA | [FB]b[GB]b AbFb | DbFb dBFB | fefg fdcA | BABd B2 :|  