Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/4
M:4/4
K:G
['', 'G D', 'e d D']  
X:1
L:1/4
M:4/4
K:G
 D |: G/A/B/A/ G D | E G D3/2 D/ | E G D G | B A A D | G/A/B/A/ G D | E G D3/2 D/ | E G F d/c/ |1 
 B G G D :|2 B G G B/d/ |: g G B g | f G c e | d D G B | c/B/A/B/ c/d/e/f/ | g G B g | f G c e | 
 d D F d/c/ |1 B G G B/d/ :|2 B G G D ||  