Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
M:3/4
K:D
['f2 dFGE', 'c2 ACDB,'  
X:1
L:1/8
M:3/4
K:D
 f2 dFGE | F2 E2 D2 | f2 dFGE | F4 D2 | GGBddB | DDFAdf | C2 e2 d2 | c6 :: c2 ACDB, | CE A2 c2 | 
 c2 ACDB, | C6 | (3efg fedc | (3def edGF | GA F2 E2 | F6 :|  