Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/4
M:3/2
K:Bb
['B, (D/ F3/2)', 'D C2']  
X:1
L:1/4
M:3/2
K:Bb
 B, | (D/ F3/2) B (c d) c | B3 G3 | (F/G/) F D C2 B, | C D2 B,2 B, | (D/ F3/2) (B c) (d c) | 
 B3 g3 | (f/g/) f d c2 B | G3 B2 :: g | (f/g/) d d c/d/ c B | (G/_A/) G F e2 e | (d f) A G2 F | 
 D3- D2 B | (A/B/) c D C2 B | A/B/ c F G2 G | (F/G/) F D C2 B, | B,3 !fermata!D2 |]  