Compose a piece of music based on the provided motif and adhering to the outlined musical structure.
X:1
L:1/8
Q:1/4=120
M:4/4
K:Bb
['B2 B2']  
X:1
L:1/8
Q:1/4=120
M:4/4
K:Bb
 F2 | B2 B2 B2"^(a)" dc | c2 F2 !fermata!F2 F2 | B2 B2 (Bc) (de) | f6 (fe) | 
 d2 (dc) B2"^(b)" (BA) | G2"^(c)" B2 F2 FF | GA B2 d2"^(d)" e2 |[M:3/2] B4 G4 F2 F F | 
 B2 B2 (Bc) (de) | f6 (fe) | d2 (dc) B2"^(b) var." B2 | G2"^(c) var." (BG) F2 FF | 
 GA B2 d2"^(d) var." (ec) |[M:3/2] B4 G4 F2 F F |[M:4/4] GA"^(e) var." (Bc) d2 (ec) | B6 |]  