Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:6/8
K:D
['d2 d', 'efg a2 ABc d3-']  
X:1
L:1/8
M:6/8
K:D
|: A |"D" f2 e d2 c |"G" d2 B"D" A2 F |"Em" G>FG"A7" EFG |"D" F2 G A2 A |"G" B2 G d2 B | 
"D" A2 F d2 d |"A7" c>de ABc |"D" d3- d2 :| d/e/ |"D" f2 f f2 d/e/ | f2 f fde |"Bm" f2 f g2 f | 
"Em" e2 e"A7" e2 c |"Bm" d2 d d2 B/c/ | d2 d dBc |"E7" d2 B e2 d |"A7" c2 B ABc || | 
"D" d2 d"A7" cBA |"G" B2 c"D" d2 A |"D" d>ed"A7" cBA |"G" B2 c"D" d2 f |"A7" e2 e e2 e | e2 e efg | 
"^(D)" a2 A"A7" ABc |"D" d3- d2 |]  