Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
M:3/4
K:Ddor
['da af fa ag (3gfg eg', '(3fef df'  
X:1
L:1/8
M:3/4
K:Ddor
 da af fa | ag (3gfg eg | gf (3fef df | fe ^cd ef | da af fa | ag (3gfg eg | gb af d>f | 
 (3e^ce [dD]4 :: df (3fef df | fe ^cd ea | af (3fef df | ag e^c A2 | df (3fef df | fe ^cd eg | 
 gb af d>f | (3e^ce [dD]4 :|  