Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/4
M:2/2
K:G
['B d']  
X:1
L:1/4
M:2/2
K:G
"G" d e/d/ B d | G d B d |"C" e g/e/"G" d B |"Am" A G"D7" E2 |"G" d e/d/ B d | G d B d | 
"C" e g/e/"G" d B |"D7" A G"G" G2 ::"G" B d g3/2 e/ | d B"D7" A G |"G" B d"C" e/f/g/e/ | 
"Am" d B"D7" A2 |"G" B d"C" g3/2 e/ |"G" d B A G | d e/d/ B A |"D7" B/A/ G"G" G2 :|  