Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:4/4
K:G
['FEFD FAAF GBBA Bc d2 FEFD FAAc', 'B2 AG FDDF']  
X:1
L:1/8
M:4/4
K:G
 FEFD FAAF | GBBA Bc d2 | FEFD FAAc |1 BcAF GBAG :|2 BcAF G2 GA || B2 AG FDDF | GEBE GEEc | 
 B2 AG FDDF | EGFA G2 GA | B2 AG FDDF | GEBE GEEc | dABG FDDF | EGFA GBAG ||  