Develop a musical composition using both the specified melodic theme and the alphabetical pattern naming.
X:1
L:1/4
M:2/4
K:G
['B F/G/ A G/F/ E E/G/ B', 'z A- A/c/ e d/c/ B3/2 G/', 'z B2 G2 A2 F2 G2 E2', 'z B2 G2 A2 F2 G B']  
X:1
L:1/4
M:2/4
K:G
 B F/G/ | A G/F/ | E E/G/ | B A/G/ | F3/2 G/ | A B | G E | E z || A- A/c/ | e d/c/ | B3/2 G/ | 
 B A/G/ | F F/G/ | A B | G E | E z :| B2 | G2 | A2 | F2 | G2 | E2 | ^D2- | D z || B2 | G2 | A2 | 
 F2 | G B | e/e/ ^d- | d z ||  