Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
Q:1/8=232
M:4/4
K:G
['Gg ed B2']  
X:1
L:1/8
Q:1/8=232
M:4/4
K:G
|: Gg ed B2 AG | (3(FED) AD BD AF | Gg ed B2 AF | DE GA BG G2 | Gg ed B2 AG | (3(FED) AD BD AF | 
 Gg ed B2 AF | DE GA BG G2 | ge dB cB cd | ea a^g ae ef | ge dc Bc BA | Gg ga bg g2 | ge dB cB cd | 
 ea a^g ae e=g | bg af gf eg | de ga bg g2 :|  