Compose a piece using the alphabetic notation of the assigned musical structure and the provided melodic motif.
X:1
L:1/8
M:4/4
K:Bb
['B2 Bc']  
X:1
L:1/8
M:4/4
K:Bb
 F | B2 Bc d2 FG | _A2 BA F2 DE | F2 GA B2 B2 | B6 e2 | d2 B2 Bc de | f2 fd e2 fe | d2 cB BA FG | 
 F6 e2 | d2 B2 Bc de | f2 fd e2 fe | d2 cB BA FG | _A6 F2 | B2 Bc d2 FG | _A2 BA F2 DE | 
 F2 GA B2 B2 | B6 ||  