Compose a musical piece using the designated musical pattern's alphabetic representation and the assigned melodic theme.
X:1
L:1/8
M:2/4
K:G
['', 'AB c2 B2 A2 GA Bd ed', 'g2 ea ab g2 ed ea ge']  
X:1
L:1/8
M:2/4
K:G
 AB |: c2 B2 | A2 GA | Bd ed | g2 d2 | ea ge | dB G A/B/ | ce dB |1 A2 AB :|2 A2 cd |: ea a2 | 
 eg g2 | ea ab | g2 ed | ea ge | dB G A/B/ | ce dB |1 A2 cd :|  