It kicked off at 8am before the marathon runners set off on their route around the city and continued long into the evening.
More than 40,000 people of all ages joined in the event which included a musicals marathon where people went to sing along to their favourite hits from well known films like Mamma Mia, The Sound of Music, Grease and the Lion King.
There were also come and try sessions, Indian and Gaelic singing, beat boxing, Commonwealth songs and events for children.
Visitors could also try out sports including athletics, cycling, hockey, judo and table tennis.
And there was the chance to create your own crafts and browse the work of designers and makers from around Scotland.
The afternoon's performance concluded with a unique mash-up of music from throughout the day, merging singing styles and traditions in a spectacular finale.
But the fun didn't stop there as the main stage was transformed into an open air cinema for a one-off sing-a-long screening of Singin' in the Rain.
Big Big Sing director Svend Brown said: "The Big Big Sing has been incredible.
"The city is absolutely buzzing with excitement and it was great to see so many people from all different countries, cultures and age groups come together to sing and feel good.
"Hearing the crowd singing Amazing Grace was a truly special moment and for me, a real highlight of the Glasgow 2014 Commonwealth Games."
Mary McTigue, from Glasgow choir Eastend Voices, said: "We've been to a few Big Big Sing events before and it feels as though they have all been leading up to today.
"The atmosphere is wonderful and so welcoming for everyone who has come to Glasgow from across the Commonwealth. It is absolutely fantastic."
Anyone who missed out on Sunday can join in the Big Big Sing on Wednesday at the Bandstand in Kelvingrove park.
Everyone is welcome and no singing experience is needed, simply go along and enjoy an afternoon of song and fun in a mass singing session.
Big Big Sing is an initiative of Glasgow Unesco City of Music and is regarded as one of the highlights of the Glasgow 2014 cultural programme.
It was set up in a bid to continue to improve the city and UK's health, happiness and well-being through singing.
To find out more about singing go to www.bigbigsing.org