Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:6/8
K:D
['f |:{c} d2', 'E (DED) (TFEF)', 'D/A/F/A/ D/A/F/A/', '.D(FA) .D(FA)', 'D/A/F/A/ D/A/F/A/', '[DGB]2 [DGB]2']  
X:1
L:1/8
M:6/8
K:D
 f |:{c} d2 (A A)FA | AFD Dfe |{c} d2 A{B} AGF | TE>FE Tc2 e |{c} d2 (A A)FA | AFA AFD | GBG FAF |1 
 (E>FE) Tc2 e :|2 (E>FE) TG2 E |: (DED) (TFEF) | DED TF2 E | (DED) (TFEF) | (EFE) TG2 E | 
 (DEF) (TFEF) | (FEF) (TFEF) | GBG AFA |1 (EFE) G2 E :|2 (EFE) Efe || 
[M:2/4]"^variation 1" D/A/F/A/ D/A/F/A/ | (3DED TF>E | D/A/F/A/ D/A/F/A/ | (3EFE TG>E | 
 D/A/F/A/ D/A/F/A/ | D/A/F/A/ D/A/F/A/ | D/G/B/G/ D/A/F/A/ |1 (EFE TG>E :|2 (EFE) Efe || 
[M:6/8]"^variation 2" .D(FA) .D(FA) | .D(GB) .DGB) | .D(FA) .D(FA) | .E(GA) .E(GA) | 
 .D(FA) .D(FA) | .D(GB) .D(GB) | .D(GB) .D(FA) |1 (EFE) TG2 E :|2 (EFE) Efe || 
[M:2/4]"^variation 3" D/A/F/A/ D/A/F/A/ | D/B/G/B/ D/G/B/G/ | D/A/F/A/ D/A/F/A/ | 
 E/A/G/A/ E/A/G/A/ | D/A/F/A/ D/A/F/A/ | D/B/G/B/ D/B/G/B/ | D/B/G/B/ D/A/F/A/ |1 
 E/A/G/A/ E/A/G/A/ :|2 (EFE) Efe ||"^variation 4" (D/F/)(A/F/) (D/F/)(A/F/) | [DGB]2 [DGB]2 | 
 [DFA]2 [DFA]2 | [CEA]2 [A,EA]2 | [DFA]2 [DFA]2 | [DGB]2 [DGB]2 | [DGB]2 [DFA]2 |1 
 [CEA]2 [A,EA]2 :|2 [CEA]2 A,f/e/ ||  