Compose a piece of music using the provided motif and follow the designated alphabet character structure.
X:1
L:1/8
M:6/8
K:Bb
['B, D2']  
X:1
L:1/8
M:6/8
K:Bb
 B, | D2 D D/ D3/2 B, CCB, | B, z B, D2 C D/ D3/2 E | F3- F z D F3/2 F/ F | (FE) D (C3/2 D/) C C3 | 
[M:6/8] G2 G | F3/2 D/ B, CDC | B,3- B, z ||  