Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:4/4
K:G
['EA GABe G2-']  
X:1
L:1/8
M:4/4
K:G
 B |"G" GDDE"Em" GABG |"Am" cA"^(G)"BG"C" E2 EA |"G" GDDE"Em" GABe |"D7" dBAB"G" G2- G :| g | 
"C" eg"G"dg BgdB |"Am" cA"^(G)"BG"C" E2 Eg |"C" eg"G"dg BgdB |"D7" cAdB"G" G2- G || g | 
"C" eg"G"db"Am" ca"G"Bg |"Am" cA"^(G)"BG"C" E2"D7" EA |"G" GDDE"Em" GABe |"D7" dBAB"G" G2- G |]  