How to remove echo from recording?

[kozikowski]

Problem is this is a song with backup music playing in the background.

I think you're the poster child for not adding to the end of someone else's post. You have a different impossible problem. Audacity can't take a performance apart into individual instruments, voices or sounds.

If the posted vocal management tools don't work, then you're only option is to find the song already filtered the way you want.

Effect > Vocal Reduction and Isolation.

http://manual.audacityteam.org/man/voca ... ation.html

Koz