Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/4
M:3/4
K:G
['D G A B3 d d3/2 c/', 'B B', 'D G A B3 B3/2 c/ d']  
X:1
L:1/4
M:3/4
K:G
 D G A | B3 | d d3/2 c/ | B3 | A3 | D ^F G | A3 | c B3/2 A/ | G3 :| G F G | c3 | e d3/2 c/ | c3 | 
 B3 | B B B | B3 | B3/2 A/ G | A3 || D G A | B3 | B3/2 c/ d | d3 | c3 | c B A | D3 | A2 G | B3 | 
 D G A | B3 | B3/2 c/ d | d3 | e3 | c B A | D3 | A A B | G3 |]  