Angelicas Celtis were the second act of the night to perform to the judges Simon Cowell, Amanda Holden, Alesha Dixon and David Walliams.
But their stunning rendition of the song Jerusalem was met with backlash by viewers with many slamming the choir for replacing the word ‘England’ with ‘Britain’.
Those watching at home flocked to Twitter to criticise the all-girl group for singing the wrong words to the patriotic English anthem which was written by William Blake in 1804.
One angered fan wrote: “Outrageous. Welsh choir Angelicus Celtis has just sung 'Jerusalem'; finished with line 'In Britain's green & pleasant land' #BGT No England?”
Angelicas Celtis changed the lyrics to Jerusalem hymn
The Welsh choir altered the words to say 'Britain' instead of 'England'
Viewers flocked to Twitter to express their outrage
“OMG some choir just changed the words to Jerusalem. Its England's not Britain's green and pleasant land. PC gone mad.? #BGT,” commented another.
A third wrote: “They just changed the words to Jerusalem! It's was beautiful but seriously that's just wrong! It's England's green and pleasant lands! #BGT.”
“DO NOT MESS WITH JERUSALEM!!!!! if you don't want to say England, don't sing the damn song #bgt,” stated another.
Paul Potts, who won the first series of Britain’s Got Talent in 2007, also took to social media to express his outrage over the choice of song.
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The lyrics to Jerusalem
He said: “Why would u give welsh choir Jerusalem as a song? Strange choice. #BGT Why not Myfanwy, or a host of other welsh songs cld b sung in English [sic].”
Meanwhile, singers The Pensionalities and dance group the Merseygirls were sent through to this weekend’s final and will be joining finalists singer Kyle Tomlinson, mindreaders DNA, magicians Matt Edwards and Issy Simpson, pianist Tokio Myers and comedian Ned Woodman.
Express.co.uk have contacted Britain's Got Talent for comment.