Craft a musical piece in accordance with the designated structure and theme.
X:1
L:1/8
M:2/2
K:C
['c2 ec A2 dc', 'e2 eg gffa'  
X:1
L:1/8
M:2/2
K:C
 c2 ec A2 dc | Bdgf edcB | c2 ec A2 dc | BGAB c2 G3 :| e2 eg gffa | aggf fedc | e2 eg gffa | 
 (3gag (3fed c2 G2 | e2 eg gffa | aggf fedc | egfe fag^f | gafg efde ||  