Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
M:2/4
K:G
['G>A BB cA B2 BA', 'eg dB cd B2 BA']  
X:1
L:1/8
M:2/4
K:G
 G>A BB | cA B2 | BA AG/A/ | BA A2 | G>A BB | cA B2 | BA dd | G2 G2 :| eg dB | cd B2 | BA AG/A/ | 
 BA A2 | eg dB | cd B2 | BA dd | G2 G2 :|  