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
['G>G AB g>f ed eE G>B B/A/G', 'ed B>d dd eg ed Bd dg']  
X:1
L:1/8
M:4/4
K:G
 G>G AB g>f ed | eE G>B B/A/G ED | GG AB g>f ed || B>d dd eg ed | Bd dg ed BA | A>A BB g>f ed | 
 eE G>B B/A/G ED | GG AB g>f ed ||  