Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
M:4/4
K:C
['AFD GFG', 'gfg bge dcd ecA Bdg']  
X:1
L:1/8
M:4/4
K:C
[M:6/8][K:G] .abc D | GFG AFD | GFG Bcd | efg dBG | ABG AFD | GFG AFD | GFG Bcd | efg dBG | 
 AGG G2 :: d | gfg bge | dcd ecA | Bdg gfg | abg afd | gfg bge | dcd ecA | Bdg dBG | AGG G2 :|  