Noel and Liam Gallagher swaggered onto stage before waving at concertgoers at Cardiff's Principality Stadium, the first stop on their long-awaited worldwide reunion tour.
The brothers launched into Hello to kickstart their first live show since their dramatic split in 2009 following a backstage fight at a gig in Paris.
The Britpop band from Manchester started promptly at 8.15pm on Friday following a short video which declared: "This is not a drill".
Before their third song, (What's the story) Morning Glory? Liam said: "Hello people, it's been too long."
He walked off stage after performing Roll With It, with Noel taking over singing duties and appearing to reference the dynamic pricing scandal, quoting the audience a price before saying "it's just gone up".
Later, ahead of launching into Cigarettes And Alcohol, Liam demanded the audience embrace, telling fans to turnaround and hug a stranger.
He said: "Right then beautiful people, I want to see you all turn around and put your arms round each other.
"And when the tunes starts, jump up and f***ing down."
Tens of thousands of fans descended on Cardiff ahead of the gig, with the stadium able to host 74,500 people.
On Friday afternoon, every pub and bar along St Mary's Street in the Welsh capital was filled with people waiting for the concert to start, with the majority wearing the Britpop band's merchandise.
The reunion announcement came 15 years after Noel quit the Britpop band, saying he "simply could not go on working with Liam a day longer", following a backstage brawl at the Rock en Seine festival in Paris.
While fans have been pleading for the group to reunite since they disbanded, website issues and controversial dynamic pricing brought outrage, with many failing to secure a spot.
Following Cardiff, Oasis will visit Manchester's Heaton Park, London's Wembley Stadium, Edinburgh's Murrayfield Stadium and Dublin's Croke Park throughout July, August and September.
The group will then head to Japan, South Korea, South America, Australia and North America.
A movie, produced by Peaky Blinders creator Steven Knight, is being made in conjunction with the reunion tour.
The band was led by lead guitarist Noel and his brother, lead vocalist Liam, during their 18 years together.
Oasis signed to independent record label Creation Records in 1993, rising to fame with the release of their debut chart-topping album Definitely Maybe in 1994.
They had hits with songs including Don't Look Back in Anger, Champagne Supernova, Wonderwall and Live Forever.
Dig Out Your Soul, the band's last studio album, was released in 2008, just months before the Paris row.
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