Construct a musical piece that integrates the provided motif and corresponds to the indicated musical structure.
X:1
L:1/8
M:2/2
K:D
['a2 a3 g f2 e(A d)e', '[DF]2 [DE]2'  
X:1
L:1/8
M:2/2
K:D
 (ef-) | f2 a2 a3 g | f2 e(A d)e =f2- | f2 a2 f d3 | B3 c B(e f2- | f)g a2 a3 g | f2 e(A d)e f2- | 
 fedB A B3 | d3 d d2 :|"^Vocal for B1, then  B2:" !slide![DD]2 [DD]2 [DD]3 D | 
 [DF]2 [DE]2 [DD]2 [DD][DD] | [DF]2 [DE]2 D2 A,2 | B,3 [B,D] [B,D]2 !slide![DD]2- | 
 [DD]2 [DD]2 [DD]3 D | [DF]2 [DE]2 [DD]2 [DD][DD] | [DF]2 D2 A,2 B,2 | [DD]3 D [DD]2 ||  