Craft a musical piece in accordance with the designated structure and theme.
X:1
L:1/8
M:4/4
K:D
['FG AD', 'G2 FG'  
X:1
L:1/8
M:4/4
K:D
|: FG | AD (3FED ADBD | GABG (3ABA FG | AD (3FED AAB=c | (3BAG GF G2 FG | AD (3DDD AAB=c | 
 (3BAGAB A2 de | (3fed ed A=cBA | (3BAG GF G2 :: FG | Addc de (3fed | eaa^g a=ged | eaa^g a=gef | 
 dcAF G2 FG | A{BAG} AAB c{dcb}ccd | edef g2 Bc | (3dcB AF GBAG | FDEF G2 :|  