Generate a musical piece using the presented motif and follow the alphabetical structure provided.
X:1
L:1/4
M:6/4
K:D
['B A G F- F/E/ D f', 'B A']  
X:1
L:1/4
M:6/4
K:D
|: B A G F- F/E/ D | f e d e E2 | B A G F- F/E/ D | f e d/c/ d D2 ::[M:3/4] | B A G | 
[M:3/2] F/G/ A G/A/ B A d |[M:3/4] e E2 |[M:3/4] B A G |[M:3/2] F/G/A/F/ G/A/B/G/ A/B/ c | 
[M:3/4] d D2 ::[M:6/4] f g a f- f/e/ d | f e d c e2 | f g a f- f/e/ d | f e d/c/ d D2 :|  