Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
Q:1/4=120
M:3/4
K:D
['D3 EFG A4 B2 (A2 B2) d2', 'A2 d2']  
X:1
L:1/8
Q:1/4=120
M:3/4
K:D
|:"^Slow." D3 EFG | A4 B2 | (A2 B2) d2 | TF3 E D2 | (E2 F2) A2 | TB4 (de) | f2 (gf)(ed) | 
{f} Te4 (de/f/) | D3 EFG | A4 B2 | (A2 B2) d2 | TF3 E D2 | G2 (AG)(FE) | F2 (GF)(ED) | (E2 F2) A2 | 
 TB4 A2 :: d2 D2 F2 | d2 (ed)(cB) | (A2 B2) d2 | F3 E D2 | E2 e2 (ef/g/) |{f} e4 (de) | 
 Tf2 (gf)(ed) | B4 (AB/c/) | d2 A2 d2 | (d>c)(de)(fe) | (d>e)(dB)(AG) | TF3 E D2 | (G>B)(AG)(FE) | 
 (F>A)(GF)(ED) | E2 F2 A2 | TB4 A2 :|  