Craft a musical piece that integrates the provided melodic theme and the corresponding alphabetical pattern.
X:1
L:1/8
M:4/4
K:Bb
['B2 FE DB,DF GEGB', 'B2 (3fga bfe[Bd] BAGF fdec BAGF egec']  
X:1
L:1/8
M:4/4
K:Bb
 FGA | B2 FE DB,DF | GEGB AFGc | B2 gf edcB | A2 c2 c2 d>c | B2 FE DB,DF | GEGB AFAc | Bbag fedc | 
 B2 B2 B2 :: (3fga | bfe[Bd] BAGF | fdec BAGF | egec dfdB | A2 c2 c2 (3FGA | GEGB edcB | 
 AFAc fedc | Bbag fedc | B2 B2 B2 :|  