Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
M:4/4
K:G
['G>D G<B', 'g>a b>g']  
X:1
L:1/8
M:4/4
K:G
 G |:"G" G>D G<B G>D G<B |"G" d>B g>B"D7" A<A A>B |"G" G>D G<B G>D G<B |"D7" d>c B>A"G" G<G G2 :: 
"G" g>a b>g d<d d2 |"G" g>a b>g e<e e>f |"G" g<b"C" e<g"G" d<g"Em" B<g |"D7" A>G A>B"G" G<G G2 :|  