Construct a melodic piece using the alphabet-based musical sequence and the given motif.
X:1
L:1/8
M:6/8
K:Bb
['[BD]3{d} cBc [BD]3 F2 F', 'B3 B2 B Bba a2 g gfe']  
X:1
L:1/8
M:6/8
K:Bb
|: [BD]3{d} cBc | [BD]3 F2 F | G2 c{B} AGA | B2 f{e} dcd | [BD]3{d} cBc | [BD]3 F2 F | 
 G z c{B} AGA | B3- B3 :: B2 B Bba | a2 g gfe | d2 c ceg | g2 f fed | cBB Bdf | fee dcB | Acd ecA | 
 B3 B,3 :|  