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
['d<B B>g', 'G/G/G B>c d<B']  
X:1
L:1/8
M:4/4
K:G
 B | G>AB>g d<B B>g | d>Bg>B d<B B>g | G>AB>g d<B B>g | a>fg>B A/A/A A>B | G>AB>g d<B B>g | 
 d>Bg>B d<B B>d | e<g d>B e>dB>g | a>fg>B A/A/A (A || B) | G/G/G B>c d<B B>d | g>ed>B A/A/A A>B | 
 G/G/G B>c d<B B>g | a/g/f/e/ g>e d<B B>d | e>fg>e d<b g>d | e<gd>B A/A/A A ||  