How can I extract background music from a video?

[19ana89]

I have Audacity, but I can't seem to get the dialogue out from the video so I just have the background music. I edited the video to the section that has the music, and converted that in to MP3, so I can work with an audio file. I tried splitting the stereo track, then I inverted the bottom, and set both tracks to mono, and exported. Didn't work. So I tried inverting the top, and did the same steps, (according to Google), but still didn't work. I thought Audacity could do that, so I downloaded it, but have no idea how to get it to work apparently. Anyone know how else I might can try doing this? Thanks!

[Moe]

You'd be better off identifying the song and sourcing it elsewhere. There is no magic that will allow you to remove the dialogue and keep the music intact.