Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:2/4
K:Bb
['F2 f4', 'Ac F2', 'GF Ff', 'FF f2 dB A/A/A/c/ F/F/F/B/ A/A/A/c/']  
X:1
L:1/8
M:2/4
K:Bb
"^A" B | B3 D | F3 B, | D2 B,2 | D2 F2 | f4 | dg fB | A3 E | F3 E | (C4 | C3) z | A3 C | F3 C | 
 E2 F2 | f4 | eg fA | !fermata!F2 z ||[M:2/4]"^B" G2 GG | g2 fe | F2 FF | f2 dB | Ac F2 | Ac F2 | 
 Bd GD | F4 | G2 GG | g2 fe | F2 FF | f2 dB | Ac F2 | Ac Fd | (B4 | B2) z2 ||"^C" B,D DG | GF Ff | 
 d3 F | GF Ff | d3 F | GF Ff | f3 e | c4 | A,C CG | GF Ff | e3 F | GF Ff | e3 F | GF Ff | d3 c | 
 B4 | B,D DG | GF Ff | d3 F | GF Ff | d3 F | GF Ff | f3 e | c4 | A,C CG | GF Ff | .eF Ac | f3 e | 
 d2 c2 | B4 ||"^D""_*" G2 GG | g2 fe | F2 FF | f2 dB | A/A/A/c/ F/F/F/B/ | A/A/A/c/ F/F/F/A/ | 
 B/B/B/d/ G/G/G/D/ | F4 | G2 GG | g2 fe | F2 FF | f2 dB | A/A/A/c/ F/F/F/B/ | A/A/A/c/ F/F/F/d/ | 
 B4 | c2 d2 | (B4 | B2) z2 |]  