Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/4
M:4/4
K:D
['A, D']  
X:1
L:1/4
M:4/4
K:D
 A, | D A, D F | A3 A, | F A G F | E (F) G | A | d c d A | B (c/)B/ A A/G/ | F G E E | D2 A G | 
 F E D C | D3 A, | D A, D F | A3 A | B B B A | B2 B c | d c B B | A3 A | A E E F | G F G A | 
 B A G F | E (F) G A | d c d A | B B A A/G/ | F G E E | D3 ||  