Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:4/4
K:G
['G>D G<B A>G A<B', 'g>a b<g']  
X:1
L:1/8
M:4/4
K:G
 g | G>D G<B A>G A<B | G<G G>B d2 d>g | G>D G<B A>G A<B | e<e e>d e2 (e :| f) | g>a b<g d>ed>B | 
 g>a b<g e2 e>f | g>a b<g d>ed>B | A<A B>d e2 e>f | g>a b<g d>ed>B | g>a b<g e2 ef | 
 g<bfa e>f g<e | d<B B>B A2 A ||  