Create a musical composition based on the alphabetic representation of the predetermined pattern and the given melodic theme.
X:1
L:1/8
Q:1/8=180
M:2/4
K:G
['dgBg fA/B/', '', 'B/c/d/e/ d/B/c/A/ BG GF/G/']  
X:1
L:1/8
Q:1/8=180
M:2/4
K:G
 Bc | dgBg | fA/B/ c/B/A | caAa | gB/c/ dc/B/ | dgBg | fA/B/ cB/A/ | FdDd | ggg :: |: 
 B/c/d/e/ d/B/c/A/ | BG GF/G/ | AEFD | g/f/g/a/ g/e/d/c/ | B/c/d/e/ d/B/c/A/ | BG GF/G/ | aefd | 
 ggg :|  