Using AI, ‘YouTube to Karaoke’ site would isolate the instrumental track of any YouTube music video and sync the lyrics with the muted vocal line.
Unfortunately, this has since caught the attention of copyright holders and has quickly been shut down for legal reasons regarding ripping YouTube videos and lyrics.
In the meantime, checkout this open-source AI tool from Deezer, that will split the vocal and instruments from any music file. Bearing copyright laws in mind, use responsibly. Only use tracks you own for commercial use.