Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
Q:1/8=30
M:3/8
K:G
['as Gmaj, bass eee eEE GAB E2', 'E3 z3 z3 Bcd e2 c d/f/e/d/c/B/', 'E3 z2 e B2 c ABB,']  
X:1
L:1/8
Q:1/8=30
M:3/8
K:G
"^Read as Gmaj, bass clef" eee | eEE | GAB | E2 z | eee | fEE | GAB | E3 :: z3 | z3 | Bcd | e2 c | 
 d/f/e/d/c/B/ | cce | eBB, | E3 :: z2 e | B2 c | ABB, | E3 | z2 e | B2 c | ABB, | E3 :|  