Craft a musical piece in accordance with the designated structure and theme.
X:1
L:1/16
M:3/4
K:Bb
['(gd)bg d4']  
X:1
L:1/16
M:3/4
K:Bb
|: dced cBdc BAcB | AGBd (gd)bg d4 | dcBd (gd)bg d4 | cBAc (^fc)af c4 | BAG^F GABc d^fga | 
 bdc^F g4 Fe G,4"^Fine" :|  