Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
Q:1/2=80
M:2/2
K:G
['D GBAc Bdce dBec AGFD (G/A/)B (A/B/)c']  
X:1
L:1/8
Q:1/2=80
M:2/2
K:G
 D | GBAc Bdce | dBec AGFD | (G/A/)B (A/B/)c (B/c/)d (e/f/)g | fde^c d3 |:  