Construct a melodic piece using the alphabet-based musical sequence and the given motif.
X:1
L:1/16
Q:1/4=60
M:3/8
K:G
['d4 B2']  
X:1
L:1/16
Q:1/4=60
M:3/8
K:G
 D2 | G4 B2 | d2d2d2 | d4 B2 | d4 B2 | e4 c2 | g2f2e2 | d4 B2 | d4 B2 | c2a2a2 | agfedc | Bdg2g2 | 
 gfedcB | G4 B2 | d2d2d2 | d4 B2 | d4 B2 | e4 c2 | (gbagfe) | d4 B2 | d4 B2 | g2 | fdAdfa | 
 gbagfg | ac'baga | bd'c'bag | fdAdfa | gbagfg | ac'bagf | g4 :|  