Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/16
M:2/4
K:Bb
['B3!p!(B/c/)!f! B3!p!(B/c/)', '(fe) (d>f)(g>f) (g>f)(e>d) (c>e)(f>e) (f>e)(d>c) (B>d)(e>d) (e>d)(c>B)']  
X:1
L:1/16
M:2/4
K:Bb
 F2 |!f! B3!p!(B/c/)!f! B3!p!(B/c/) | .d2.B2 .e2.c2 | B3!p!(B/c/)!f! B3!p!(B/c/) | .c2.A2.B2F2 | 
!f! B3!p!(B/c/)!f! B3!p!(B/c/) | .d2.B2 .e2.c2 | B3!p!(B/c/) (B>c)(d>e) | .f2.F2 B2 |] (fe) | 
!p! (d>f)(g>f) (g>f)(e>d) | (c>e)(f>e) (f>e)(d>c) | (B>d)(e>d) (e>d)(c>B) | .A2.c2.c2 e2 | 
 (g>e).e.e (f>d).d.d | (e>c).c.c (Ac)(cF) | (G2>A2) (cB)(AG) | (F2>B2) B2 |]  