Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
Q:1/2=80
M:4/4
K:Bb
['D2 (F<B) (d<f)(d<B) c2 (e<c) G<cA<F B2', 'd2 (d<B)', 'B2 (D<B,)']  
X:1
L:1/8
Q:1/2=80
M:4/4
K:Bb
 D2 (F<B) (d<f)(d<B) | c2 (e<c) G<cA<F | B2 (F<_A) G<ED<C | D<Fd<c B2 B,2 |: d2 (d<B) d2 (d<B) | 
 (d<B)(f<d) B2 d2 | c2 (c<G) c2 (c<G) | A<BF<B D2 B,2 |: 
 d2 (f/4e/4d3/2) (f/4e/4)d3/2 (f/4e/4)d3/2 | fbag f2 d2 | e2 (g<e) f<de<c | 
 B<gf>e d2 B2 B2 (D<B,) B2 (D<B,) | (E<c)(B<A) B2 F2 | B2 (F<D) B2 (F<D) | E2 F2 [B,FB]4 |]  