voice remover?

Hey guys, is there any kinda free software or something that can remove voices from a song? or just a technique that works…? any help would be great thanks

you can try audacity (free)

there is a fair bit of information on the web
but if the vocal track is in the middle you can split the left and right channels then invert one
that should cancel what is in the middle (vocal track)
but it only works if the vocals or in the middle of the stereo track