Eurovision’s reigning champion Netta began the first semi-final emerging from a giant cat, with the remixed version of her song Toy playing in the background.
On hand to present the coverage for the United Kingdom were BBC Radio 1 presenter Scott Mills, 45, and This Morning guest host, Rylan Clark Neal, 30.
As Netta performed the song, fans of the singing contest realised it was a very different version of the winning anthem from last year.
Taking to Twitter, viewers aired their thoughts on the remix, with one posting: “Fair play Netta. This is an excellent way to open the whole shebang. #Eurovision.”
Another wasn’t too convinced however, remarking: “I forgot how awful this song was I predict even more nightmares tonight… #Eurovision.”
A third wrote: “Thanks for reminding me how awful that song is #Eurovision,” with a fourth giving a different opinion: “Omg this remix is insane #Eurovision.”
The flurry of support for Netta didn’t stop there, with a fifth adding: “Wow! That’s how you open a show. @NettaBarzilai .”
However, other’s weren’t too happy with the performance, stating: “Last year’s winner was utter tosh. Bring back the SONG Contest. #Eurovision.”
Some viewers questioned why Netta was even performing, enquiring: “Shouldn’t Netta be opening the final not the first semi? #eurovision #Eurovision2019 #EuroSemi1.”
After Netta began the competition, it was time for the ten countries performing for the first semi-final to take to the stage.
Tonight will be the first of two semi-finals to air on BBC 4 this week, with the final show airing on Thursday ahead of the grand conclusion on Saturday night.
Hoping to secure their place in the final this weekend were performers from 16 European countries as well as Australia.
Only 10 of the 17 performers will go on to the final, with their fates lying in the hands of the countries performing as well as two of the Big 5 who are automatically given a place in the grand final and the host country
Spain, France and Israel will be casting their votes tonight, meaning the UK, Germany and Italy will cast their votes on Thursday night.
The latest odds from the bookmakers seem to suggest the Netherlands will be reigning victorious this weekend.
Singer Duncan Laurence is the entrant for the Dutch, performing his track Arcade for fans of the Eurovision Song Contest.
Bookmakers Coral have the Netherlands caches at winning the final at 2-1 on their latest odds table, with Sweden hot on Duncan’s heels at 4-1.
Coral’s Harry Aitkenhead said: “The Netherlands are the ones to beat for Eurovision 2019, and they’re expected to breeze through the second semi-final later in the week.”
However, the odds don’t look too good for the UK’s entrant Michael Rice, with the All Together Now winner’s chances at securing the win at 100-1.
Russia could also be in big trouble as signer Sergey Lazarev revealed his rehearsals had been tainted with technical difficulties.
The Eurovision Song Contest 2019 final airs Saturday at 8pm on BBC One.