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:G
['G2 GA BddB', 'ef gbaf gedB']  
X:1
L:1/8
M:4/4
K:G
|: G3 A BddB | eBdB eBdB | G2 GA BddB | AcBA GEDE | G2 GA BddB | eBdB d ef | gbaf gedB |1 
 AcBA GEDE :|2 AcBA GEDf |: g3 a gedf | eBdB d2 ef | gbaf gedB | AcBA GEDf | g2 ga gedf | 
 eBdB d2 ef | gbaf gedB |1 AcBA GEDf :|  