Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:4/4
K:Bb
['[DB]2 (F>E) (D/E/F)', 'A>GF>=E (3_EGc (3Acf']  
X:1
L:1/8
M:4/4
K:Bb
 d | [DB]2 (F>E) (D/E/F) B,>D | E2 (c>B) (A/B/c) F/f z/ | [DB]2 (F>E) (D/E/F) B>D |1 
 E<G C<F B,2- B, :|2 E<G C<A B2- B || e | (d/c/B) F7/4B/4 d7/4B/4 f/4B7/4 | A>GF>=E (3_EGc (3Acf | 
 (d/c<B) F/B d>B{a}b>B | (3EGB (3Acf B2- B>e | (d/c/B) F7/4B/4 d7/4B/4{a} b>B | 
 A>GF>=E (3_EGc (3Acf | (3gfd (3gec (3fdB (3ecA | (3BFD (3FEC B,2- B, ||  