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
['G B', 'g f/e/ d c B']  
X:1
L:1/4
M:4/4
K:G
 G B G B | G B c/B/A/G/ | F A F A | F A d/c/B/A/ | G B G B | G B d3/2 B/ | c/B/A/G/ F/G/A/c/ | 
 B G G2 :: g f/e/ d c | B c d2 | g f/e/ d c | B d A2 | g f/e/ d c | B c d B | c/B/A/G/ F/G/A/c/ | 
 B G G2 :|  