Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
M:2/4
K:G
['A>G FG']  
X:1
L:1/8
M:2/4
K:G
 B |"G" BB c>A | AG Bd |"D7" A3 A |"G" BB Bc/>A/ | BA Bd |"Am" A2 AA | AA A>G |"D7" FG Ac | 
"G" B2 AG |"Am" cB A>G |"D7" FG AB |"G" G2 z2 |]  