Hi I have just started playing the saxophone and am not very tech minded. 
I have managed to get the track i want Monkey man by Amy Winehouse and the Specials downloaded and removed the main vocals. There are still some backing vocals and is it possible to remove these. If anyone is Middlesex / London wy and could give me a tutorial that would be great, is it possible or difficult im not a mixer…LOL
I’ll go with “not possible”.
I’d also recommend updating to the current 2.3.1 version of Audacity. It’s available via the Audacity website: https://www.audacityteam.org/download/windows/