Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
M:3/4
K:G
['d BA']  
X:1
L:1/8
M:3/4
K:G
"G" B2 BA AB |"Em" B3 G GA |"C" A3 B cB |"D" BA AG GA |"G" B2 BA AB |"Em" B3 G GA |"C" A2 AB cB |1 
"D" A6 :|2"D" A3 d BA |:"G" G3 A BD |"C" E3 d BA |"G" G3 B"Am" ce |"D" dF Ad BA |"Em" G3 A BD | 
"C" E3 d BA |"Am" GF GB ce |1"D" d3 d BA :|2"D" d6 ||  