Construct a musical arrangement using the specified alphabetical sequence and the given motif as a foundation.
X:1
L:1/4
M:none
K:G
['_B c']  
X:1
L:1/4
M:none
K:G
 G2 A =F G | _B c A2 B c d2 | c _B A z/ A/ | c A _B G | _B c A2 G G D2 D | =F G A A/G/ | 
 _B c d z/ c/ B B/B/c/B/A/B/ | G F G2 |]  