Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
M:5/8
K:G
['d BG']  
X:1
L:1/8
M:5/8
K:G
 D |"D7" FA"G" GB d |"D7" cA"G" BG D |"D7" FA"G" GB d |"D7" cA"G" G2 :| d |"D7" cA"G" BG d | 
"D7" cA"G" BG d |"D7" cA"G" BG D |"D7" FA"G" G2 || d |"D7" cA"G" BG d |"D7" cA"G" BG D | 
"D7" FA"G" GB d |"D7" cA"G" G2 |]  