Construct a musical piece that contains the provided motif and abides by the prescribed alphabetical scheme.
X:1
L:1/8
M:6/8
K:Dmix
['BAG B4 AG A4 (3FGA F D3-', 'dBG e4']  
X:1
L:1/8
M:6/8
K:Dmix
|: BAG | B4 AG | A4 (3FGA | F D3- D2 | G3 GAB | d B4 d | e6- | e4 ef | g4 af | g4 fe | d B3 AB | 
 c2 B A2 F | G E3 GA | B2 A G2 F | G/F/ E3 DE | E6- | E3 :: d3 dBG | e4 dB | A4 GF | G2 (3FGA B3- | 
 B3 dBG | e4 ef | g6- | g4 ef | g4 af | g4 fe | d B3 AB | c2 B A2 F | G E3 GA | B2 A G2 F | 
 G/F/ E3 DE | E6 :|  