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 e>dB>A B<GG>B d>ed<B B<dd>g e>dB>A B<GG>f', 'd>eg>a b>ga<b']  
X:1
L:1/8
M:4/4
K:G
 g |: e>dB>A B<GG>B | d>ed<B B<dd>g | e>dB>A B<GG>f | g>ef<d e2 e<g :| d>eg>a b>ga<b | 
 d>ed<B B<dd>B | d>eg>a b>ga<b | e>ba<g d<ee>g | d>eg>a b>ga<b | d>ed<B B<dd>g | e>dB>A B<GG>f | 
 g>ef<d e2 e<g ||  