On the smaller King Tut’s Stage, Big Special, who hail from the West Midlands, declared Glasgow to be “the Birmingham of Scotland”, before delivering an abrasive set of rock, hip hop and soul.
The band – singer Joe Hicklin and drummer Callum Moloney – later told BBC Scotland News they feel the two cities have much in common.
“They’re both the second cities of each country, they have these industrial roots and there’s a part where they deal with a snobbishness from other places to them. There’s also a similar sense of humour with them”, said Moloney.
Moloney said he felt there was a “sense of loss” among the crowd after the football result but the audience soon warmed up as they played.
“By the time we walked off folk were screaming and it’s always a class crowd – especially in the sun.”
On the Main Stage, local heroes The Fratellis sparked one of the day’s biggest sing-a-longs with Chelsea Dagger, having also covered Tartan Army anthem Yes Sir I Can Boogie earlier on, while English Teacher’s wiry post-punk was warmly received by a somewhat small crowd.
However crowds started to grow from late afternoon into the evening, with the theatrical rock of the Last Dinner Party earning a strong reaction. Singer Abigail Morris made full use of the stage to prowl around and lead the crowd into a wild sing-a-long to Nothing Matters.
Other fans sought out the BBC Introducing Stage to shelter in the shade and listen to emerging acts like Lanarkshire quintet Tanzana and their moody, atmospheric rock. The sound there suffered though, from noise from the Main Stage drifting over.
Glasgow band Twin Atlantic also performed a secret set on the festival’s Hangout stage after a band listed as Triplet Pacific was listed as performing there.
The event will continue on Sunday, where Lewis Capaldi tops the bill.
Highlights programmes and full sets from acts are available on BBC iPlayer.