Create a musical composition using the given alphabetical pattern and melodic theme.
X:1
L:1/4
M:4/4
K:G
['B A']  
X:1
L:1/4
M:4/4
K:G
 G D/>D/ B, D | G G G z | B B A B | c B A z | A A d d | A/G/F/E/ F D | A A d d | A/G/F/E/ F D | 
 G G A A | B B A z | B B A z | d3/2 c/ B B | A A G z |]  