With the scale of some of the performances, the moving around and dancing, it seems almost impossible acts could sing live at the same time.
However, Eurovision rules say acts must sing live. That said, no live music performances are allowed.
Eurovision rules clearly state "all songs shall be performed live on stage with a recorded backing track". Backing tracks may contain backing vocals, as well as a melody, however the vocal shall not "replace or unduly assist the lead vocals" during the live performance.
You can find out more rules and FAQs about Eurovision here. Tonight, nations from across Europe - and slightly further afield - will sing for the title of Eurovision winner 2022.
This year, Sam Ryder will represent the UK with his song Space Man. Sam rose to fame through TikTok, after posting music covers during the first lockdown in 2020.
The UK hasn't won a Eurovision Song Contest for 25 years. We last won in 1997, for the fifth time, with Katrina and the Waves’ song Love Shine a Light.
Could this year be the one? You can check out the Eurovision betting odds here.
The Eurovision Song Contest Grand Final 2022 will air from 8pm on Saturday (May 14) on BBC One and BBC iPlayer
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