Isolate Tap Sounds

I'm working on a dance recital DVD and there are a couple tap dance numbers. I recorded the tap sounds on an external mic and got the music directly into the camera. However, the external mics also picked up the music from the speakers in the audience, so now the tap sounds are a little overpowered by the music. Is there a way to lower the volume of the music and amplify only the tap sounds? Thanks!