Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
Q:3/4=60
M:3/4
K:D
['de f2 e2 d4 A2 fg a2', 'fgagaf efgfge'  
X:1
L:1/8
Q:3/4=60
M:3/4
K:D
|: de f2 e2 | d4 A2 | fg a2 g2 | f4 e2 | de f2 e2 | d4 A2 | fg a2 g2 | f6 ||"^brisk" fgagaf | 
 efgfge | fgagaf | efgfge | de f2 e2 | d6 |]  