Develop a musical composition using both the specified melodic theme and the alphabetical pattern naming.
X:1
L:1/4
M:3/4
K:G
['B A']  
X:1
L:1/4
M:3/4
K:G
 D | G2 A | B2 B | c B A | G2 D | G2 A | B2 B | c B A | G2 G | B2 B | A2 B | A G E | D2 D | G2 A | 
 B A G | A2 A | G2 |]  