Construct a melodic piece using the alphabet-based musical sequence and the given motif.
X:1
L:1/8
M:2/4
K:G
['g2 fe', 'D2 d2 f2 a3 c cBgB c2']  
X:1
L:1/8
M:2/4
K:G
 g2 fe | dcBA | AcBA | B2 G2 | g2 fe | fbag | fed^c | d2 D2 :: d2 f2 | a3 c | cBgB | c2 Ac | defg | 
 cBec | BAGF | G2 G,2 :|  