Compose a piece adhering to the given musical structure and theme.
X:1
L:1/4
Q:1/4=140
M:4/4
K:Bb
['(B A)']  
X:1
L:1/4
Q:1/4=140
M:4/4
K:Bb
 B2 F E | (D3/2 E/ F) e | (d c) (B A) | B3 B | d3 c | B3 d | (e d) (c B) | (B A) (G F) | G3 A | 
 B2 A2 | B4 | c2 c c | d3 c | (d c) (B A) | B3 B | (B A) (A G) | (G F) (F e) | (d c) (B A) | B3 F | 
 (G3/2 A/ B) c | B2 A2 | B4 | d3 c | B2 B2 | c3 B | A2 A2 | B3 c | d2 e c | B2 A2 | B4 |]  