Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
Q:1/4=160
M:4/4
K:G
['G2 BB G2 B2']  
X:1
L:1/8
Q:1/4=160
M:4/4
K:G
 D2 |"Em" EFGF E2 B2 | EFGF E2 B2 |"Am" c2 Ac"G" B2 G2 |"D" AG F2"Em" E2 :| D2 |"G" G2 BB G2 B2 | 
"D" AGFG A2 dd |"G" G2 BB G2 B2 |"D" AGFE D2 d2 |"G" G2 BB G2 B2 |"D" AGFG A2 dd | 
"G" BdcB"D7" AcBA |"G" G2"D" F2"G" G2 |]  