Develop a musical composition using both the specified melodic theme and the alphabetical pattern naming.
X:1
L:1/4
M:4/4
K:G
['B/A/ G', 'c/B/ A']  
X:1
L:1/4
M:4/4
K:G
|: B/A/ G B/A/ G | A B c2 | c/B/ A c/B/ A | B c d2 | d/c/ B g d | e f g e | d c B A | B/A/ G G2 :: 
 g d d c | B/A/ G G B | c/B/ A c/B/ A | B/c/ d d g | g d d c | B/A/ G G c | c/B/ A c/B/ A | 
 B/A/ G G2 :|  