It was a replacement for the much-missed T in the Park, bringing the music into the city centre to negate the need for camping.
Since then the likes of Queen, Arctic Monkeys, The Strokes, and Pulp have graced the stage - with local heroes Lewis Capaldi and Gerry Cinnamon cutting their teeth on the smaller stages.
The 2024 festival will take place over three days from July 12-14 with tickets already on sale.
No acts have been announced yet, but here are a few that would very much fit the bill.
1. Dua Lipa
Pop superstar Dua Lipa is hot favourite to headline Glastonbury in 2024. Might she also make a stop at Scotland's biggest music festival?
Rock band Garbage, fronted by Scotland's own Shirley Manson, have been on the road this year in America co-headlining with Noel Gallagher's High Flying Birds. An 8th studio album is on the way so a return to Scotland in 2024 is on the cards - maybe at Glasgow Green.
3. The Libertines
The Likely Lads have a new album out in 2024 - 'All Quiet On The Eastern Esplanade' will be released in March. They'll be touring the new songs along with the old favourites and would be a popular headliner for TRANSMT. Pete, Carl and co. headlined the penultimate T in the Park back in 2015.
4. The Kaiser Chiefs
Another band who will be playing new songs in 2024 at The Kaiser Chiefs, with their 'Easy Eighth Album' out in March. They have no shortage of singalong songs to keep the TRNSMT happy. We predict a riot!