Friends and students Sue Son and Janine are a classical act who play violin and keyboards. However, the judges are not impressed by Janine's musical composition 'Chance'.
"I think you are both talented musicians, especially you with the violin, but I don’t think the two go together at all," says Simon. "I thought the song was dreary and indulgent and I don't see where you are going with this."
After the girls leave the stage, the panel have a discussion and call back violinist Sue and make her an offer.
"We have had a conversation and we think you are really good but none of us think the act is very good," says Simon. "What we want to ask is if you will come back to audition on your own tomorrow?"
She returns the next day with her best friend's blessing and wins a standing ovation for a cover of Vanessa Mae's 'Storm' on electrical violin.
"I know it was a tough decision to leave your best friend, but that is going to be the best decision you ever made because that was phenomenal," remarks Amanda Holden. Simon agrees with her sentiments, also describing her as "phenomenal".
Britain's Got Talent airs tomorrow at 8:20pm on ITV1.