Hello.I have been using Audacity for a long time.I can nightcore music.But this time.I want to take only the beat from a song.And get the vocals out.The Singer.When im watching Youtube videos there is a problem.I have audacity 2,2,2 And when im doing what Youtube videos are doing the vocals are in the background.Im so bad at english.But i can talk 
So Please help me. Thank you!
See: https://manual.audacityteam.org/man/tutorial_vocal_removal_and_isolation.html
and: https://manual.audacityteam.org/man/vocal_reduction_and_isolation.html
And note that it is not always possible - it depends on the recording …
WC