Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/4
Q:1/4=125
M:4/4
K:C
['e g']  
X:1
L:1/4
Q:1/4=125
M:4/4
K:C
 z2 c A | G3/2 G/ A c | c/ c3/2 e g | a3/2 g/ a g | e/ g3/2 e g | a2 g e | d/ c3/2 d e | 
 f3/2 e/ d c | A/ c3/2 c A | G2 A c | c2 e g | a3/2 g/ a g | e/ g3/2 e g | a2 g e | d/ c3/2 d e | 
 f3/2 e/ d c | A/ c3/2 c A | G2 A c | c2 z2 |]  