Compose a musical piece using the designated musical pattern's alphabetic representation and the assigned melodic theme.
X:1
L:1/4
M:2/2
K:Gdor
['B c', 'G d']  
X:1
L:1/4
M:2/2
K:Gdor
 G G B B | c c d2 | g z d z | c A B c | d2 G2 :: G d d d | c d B2 | d z c z | G A B c | A G | 
 d z c z | G A B c | A G | d z e z | d c B B | A A G2 :|  