Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/8
M:2/4
K:G
['GG BG/B/ dB g>e dB B/A/G/A/', 'G d g2 f>e Be e>f g2']  
X:1
L:1/8
M:2/4
K:G
 D | GG BG/B/ | dB g>e | dB B/A/G/A/ | BG ED | GG BG/B/ | dB g>e | dB B/A/G/A/ | BG G :| d | 
 g2 f>e | Be e>f | g2 f/g/f/e/ | Be eg/e/ | d/B/G/B/ dd | e/d/e/f/ gg/e/ | dB B/A/G/A/ | BG G :|  