Craft a musical piece in accordance with the designated structure and theme.
X:1
L:1/8
M:4/4
K:C
['A2 A2 B2 B2 AFAd f2 f2', 'a2 ba f2 f2'  
X:1
L:1/8
M:4/4
K:C
[M:2/2][K:D] f Bae .C f e Pade!p!a aea[Q:1/8=300]FG | A2 A2 B2 B2 | AFAd f2 f2 | gfed cABc | 
 e2 dB A2 FG | A2 A2 B2 B2 | AFAd f2 f2 | gfed cABc | e2 dc d2 :| fg | a2 ba f2 f2 | a2 ba f2 f2 | 
 gfed cABc | e2 dB A2 fg | a2 ba f2 f2 | a2 ba f2 f2 | gfed cABc | e2 dc d2 :|  