Changing the song playing in the radio of Portal?

[rammaster]

Anyone know what file to replace for the song playing in the radio? I'm planning to incorporate a song with a Portal machinima I'm doing. Anyone know?

[Slasha00]

Replace it with GG

[Stinky]

I think I found it, in sound\ambient\music\looping_radio_mix.wav

Make a file of that same file name, and put it in that folder.