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
['', 'B>GA>G E<GD>G E<GD>G A2 A>d B>GA>G E<GD>d', '(3BAG d>G']  
X:1
L:1/8
M:4/4
K:G
 d |: B>GA>G E<GD>G | E<GD>G A2 A>d | B>GA>G E<GD>d | B<dD>E G2 G>d | B>GA>G E<GD>G | 
 E<GD>G A2 A>d | B>GA>G E<GD>d | B<dD>E G2 G>d :: (3BAG d>G B>Gd>G | (3BAG d>G A2 A>d | 
 (3BAG d>G B>Gd>c | B<dA>B G2 G>d | (3BAG d>G B>Gd>G | (3BAG d>G A2 A>d | B<dA>B G>ED>d | 
 B<dD>E G2 G>d :|  