Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
Q:1/8=60
M:2/4
K:C
['cd ef g3 g fe fg', 'g2 eg gg f2 f2 df ff'  
X:1
L:1/8
Q:1/8=60
M:2/4
K:C
 cd ef | g3 g | fe fg | a2 g2 :: eg gg | f2 f2 | df ff | ed c2 :|  