I want to take a current, being played on the radio, music track and cover up bad words in the song. I'm looking for the cheapest and easiest program out there to do this with. Any ideas?

Basically, I have been put in charge of preparing music for a bunch of high school boys who listen to a lot of rap and we play music but getting "clean" versions are not the same as it used to be back in the day. "Clean" on the radio today is still questionable when your trying to represent yourself in the public.

Audacity

I haven't used it in about 3-4 years, but it worked well for me then

Gold wave is an app that I use and it works well. There is a free version as well.