Construct a musical work that combines the specified alphabet-based pattern with the given melodic theme.
X:1
L:1/8
M:3/4
K:Bb
['f2 f2', 'd2 Bdf_a g2 (eg)(ce)(Ac) Bd f4 e2', 'c2 BA{A} B4 c2 d2 =e2 fc{c}', 'F2 G2']  
X:1
L:1/8
M:3/4
K:Bb
 b2 f2 f2 | f2 defg |{f} e4 d2 |{d} c4 B2 | F2 BFBd | c2 FAde | df e2 d2 |{d} c6 :: (3f=ef c2 A2 | 
 FAd=e d2 | (3bab f2 d2 | Bdf_a g2 | (eg)(ce)(Ac) | Bd f4 | e2 d2 c2 | B6 :| 
[M:3/4]"^Trio" !fermata!F2 G2 A2 | (3BAG G4 | (3cde d2 c2 | BA{A} B4 | c2 d2 =e2 | fc{c} (3cBc d2 | 
{c} B2 A2 G2 |{G} F6 :: f2 f3 d | (eg) c4 | e2 e3 c | (df) B4 | F2 G2 A2 | BF F2 G2 |{F} E2 D2 C2 | 
 B,6 :|  