mixing songs

i have to audio tracks with different background music for the tracks i want to make those into one song by removig the background music for both tracks and keep the vocals only can you help me do that

Audacity 2.1.2 has Effect > Vocal Reduction and Isolation. That may help.

Having two different songs with the same vocal doesn’t help the isolation There’s a good chance the vocals were changed during production mixdown and there’s zero chance they’re exactly the same vocal because of MP3 distortion.