Just downloaded Limewire Basic and turned filter content "on". Proceeded to download audio and got warning that license content could not be found- proceed anyway?

Can I download files like this? I tried a Metallica song beacuase I know my 16 y/o will try to download them & because of their involvement in copyright laws. I also tried dowloading a song from the 30 y/o cartoon Charlottes Web. Both got this warning.

These songs will be burned onto CD's for private listening only. Can I copy/burn this type of stuff or am I in violation of applicable laws?

I really don't want my son or I to be contacted by federal authorities 6 months from now with a warrant.

An honest and frank answer is appreciated.

Thank you - Ken