Compose a piece using the specified musical pattern based on the alphabet and the provided melodic theme.
X:1
L:1/8
M:2/4
K:G
['', 'BB/B/ (B/c/)B/A/', 'gf ee/e/ ee/e/ FA FA dd/d/ de']  
X:1
L:1/8
M:2/4
K:G
 B/A/ |: GB DG | BB/B/ (B/c/)B/A/ | GB DF | AA/A/ (A/B/)A/G/ | FA FA | dd/d/ de |1 f>e dc | 
 BB/B/ (B/c/)B/A/ :|2 f>e de/f/ | gg g2 |]: dg ba | gg/g/ gg/g/ | Bd gf | ee/e/ ee/e/ | FA FA | 
 dd/d/ de |1 f>e dc | BB/B/ Bd :|2 f>e de/f/ | gg g2 |]  