is there an app for editing song content?

[jfgoodysr]

Pardon me if there's an obvious answer, but I just don't know. Is there an app I can use to remove explicit language from an mp3? I have alot of good stuff I can't play with my 9yr old around, unless a few words "go away". Is there something I can use? I have used ringtone makers, but they won't do what I want. Thanks for any help!