Compose a piece of music using the provided motif and follow the designated alphabet character structure.
X:1
L:1/8
M:2/4
K:G
['B2 GB', 'B2 GB']  
X:1
L:1/8
M:2/4
K:G
|: B2 GB | cecA | B2 AG | FA c2 | B2 GB | c2 Ac | BGAF | G2 G2 :: B2 GB | dgdB | c2 Ac | fafd | 
 Bd g2 | dBAG | c2 ec | B2 A2 | B2 GB | cecA | B2 AG | FA c2 | B2 GB | c2 Ac | BGAF | G2 G2 :|  