Produce a musical composition based on the provided chord structure.
'G', 'G', 'D', 'G', 'G', 'C', 'D', 'G', 'D', 'G', 'Em', 'C', 'Em', 'C', 'Em', 'C', 'D', 'G', 'D', 'G'  
X:1
L:1/8
M:9/8
K:G
"G" BAB DFA B2 c |"G" BAB"D" DGF"G" G2 A |"G" Bcd edB"C" c2 B |1"D" AFD EGF"G" G2 A :|2 
"D" AFA BAF"G" G2 d |:"Em" ede gfd"C" e2 d |"Em" efg aba"C" g2 f |"Em" edB AGA"C" c2 B |1 
"D" AFA BAF"G" G2 d :|2"D" AFD EGF"G" G3 ||  