Compose a piece using the specified musical pattern based on the alphabet and the provided melodic theme.
X:1
L:1/8
M:6/8
K:Bb
['dcBFDF GBB']  
X:1
L:1/8
M:6/8
K:Bb
 dcBFDF | GBB B2 z | dcBFDF | GBB B3 | dcBFDF | GBB B3 | Bcd e2 c | d2 B c2 B | d2 dfed | 
 e2 d c2 c | f2 d e2 c | d2 cBFF/F/ | GFEDEF | GBB B2 z | Bcd e2 c | d>dB c2 B | d>defed/d/ | 
 eed c2 z | f>fdeec | ddcBFF | GFEDEF | GBB B3 |]  