Compose a piece adhering to the given musical structure and theme.
X:1
L:1/8
Q:1/4=180
M:4/4
K:Bb
['(BA) B2 B,2 B,2 (FE) (DF) B2', '[BD]2 (FE) DFBF DFBF G2 E2 E2'  
X:1
L:1/8
Q:1/4=180
M:4/4
K:Bb
 (BA) | B2 B,2 B,2 (FE) | (DF) B2 BdcB | c2 C2 C2 (cB) | (Ac) f2 f2 (ga) | (ba).g.f (gf).e.d | 
 edcB BAGF | GBAc Bdce | d2 [BD]2 [BD]2 :: (FE) | DFBF DFBF | G2 E2 E2 (GF) | =EGcG EGcG | 
 A2 F2 F2 (ed) | e2 g2 gfed | (ed).c.B (BA).G.F | GBAc Bdce | d2 [BD]2 [BD]2 :|  