Construct a melodic piece using the alphabet-based musical sequence and the given motif.
X:1
L:1/8
M:4/4
K:G
['B2 Ac']  
X:1
L:1/8
M:4/4
K:G
 edBA G3 A | B2 Ac BEEF | G3 E DEGA | BGdB A2 Bd | edBA G3 A | B2 Ac BEEF | G3 E DEGB | 
 B2 Ac BG G2 :|  