If you sing or someone else sings for you, all you need is a microphone connected to your DAW.
If you want to do a remix, the situation is more complicated due to legal issues.
A. An artist isn't necessarily going to let you remix their song, and it would be really easy if some random guy released a Queen remix. You can ask the rights holders for permission. If a major label responds, they can charge you thousands of euros just to use a famous name.
B. You, an unknown, are devaluing their repertoire. They, now famous, don't need your music: you're penalizing them if you release crap and sign it as Freddy Mercury.
C. The legal solution is called a cover. Just don't use the original material, let alone the artist's name, and then pay a mechanical license, ranging from 10 to 100 euros maximum: today we don't even pay that, so be careful. Either you sing the song again or you change the timbre of your voice so that it sounds like a different person, like I do.
Your song won't be called
John Lennon - Imagine [Your Name Remix]
You'll produce it as
Your Name - Imagine,
filling in any metadata crediting the composer, writer, and producer of the original album.
Unless you're provided with stems, you'll need to use software to rip the vocals.
There are many programs that extract audio from a song, and many even work online.
I use izotope RX, which is by far the best program I've ever used.
https://www.izotope.com/en/products/rx.html
I had a thing about remixing Show - Informer. Only old physical copies exist. So I bought a remix on Bandcamp, which is of decent quality.
You can find the feature at Music Rebalance > Acapella
This is the audio I managed to extract: the entire song. You can listen to a preview.
Today I used Antares' Autodist, one of my favorites. Remember to tell it to wait for MIDI inputs, which will be your newly created score.
Other excellent plugins, with different sounds, are:
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I'll leave you with a minute's preview of the album, mixed just today. I'm pressing it on vinyl this 2026, and it will also be released on the standard digital distribution, without paying royalties or asking for permission. Worst case scenario, if the original is credited as the source, I'll pay the mechanical license. ;)