The couple were caught completely unaware of what was going to happen. Hannah O’Brien, a friend of the couple, spent several weeks before the big day persuading all the friends and family members who attended the weather forecast to join in the song.
Rachel’s father even joined in secret rehearsals to surprise the happy couple.
According to The Sun, Hana is also a member of a female vocal harmonious group known as Starling Blue.
Since all the members were planning to attend the party, Hannah realized that they had a golden opportunity to plan something amazing.
For the past five weeks leading up to the party, Hannah had secret practice meetings. Starling Blue was on hand to teach melodies and harmony.
The adorable video shows a large number of guests standing in their seats and singing together while the couple sits and watches in awe. They ended up in the corridor and continued singing while Rachel and Shane wiped their tears.