Craft a musical piece that integrates the provided melodic theme and the corresponding alphabetical pattern.
X:1
L:1/8
Q:1/8=128
M:4/4
K:Gmin
['B<G G>B D<G G>B c<F F>A c<F', 'g<d b>d']  
X:1
L:1/8
Q:1/8=128
M:4/4
K:Gmin
|: d | B<G G>B D<G G>B | c<F F>A c<F c>A | B>A B>F D<G B>d | c<A d>c B<G G>d | B<G G>B D<G G>B | 
 c<F F>A c<F c>A | d<b c>a B<g A>^f | g<e d>c B<G-Gd || g>a b<a g<d b>d | c<a B>g A<F c>A | 
 g>a b>a g<d b>d | c>A d/e/d/c/ B<B B>d | g>a b>a g<d b>d | c<a B<g A<F c>A | 
 (3(BdB) (3(GBG) (3(DGD) (3(B,DB,) | C>A, D>C B,<G, G, :|  