Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
M:2/4
K:G
['d/B/d/e/ dB']  
X:1
L:1/8
M:2/4
K:G
 d | (c/B/A/G/) dG | Bd d(e/f/) | g({ag}f/e/) a(g/f/) | gA Ad | (c/B/A/G/) Bd | c'bag | 
 (f/g/a/f/) d(e/f/) | gG Ge | d/B/d/e/ dB | d/B/d/e/ dB | c'a ab | c'a ad | B/c/d Gd | Fd Ee | 
 (f/g/a) ea | (g/f/e/f/) dd | ef ga | bg g(a/b/) | .c'.a .a.d' | c'/b/a/b/ gd | d/e/d/c/ Bd | 
 ge ce | fg/a/ df | gG G |]  