“I’ll get nervous before I go on,” he admits.
“Every show is important because I still see myself as a music fan – I still buy tickets and go to gigs. I want those people who are like me to have a good time.
“I like to communicate my joy in playing to the audience – that’s what I’ll be doing [at The Biggest Weekend]. I couldn’t stop. I need to play music.”
Jamie will take to the stage tomorrow in Coventry, but he’s looking forward to watching other acts on the bill, including Liam Gallagher, Stereophonics, Paloma Faith and Snow Patrol.
“I’ve met all of those people a few times and you do get to mingle backstage, so it’s fun,” he reveals.
“The good thing about it is there are all sorts of different acts on smaller stages too.
"It’s the kind of thing that we do really well in this country.
"If you travel abroad, they are always surprised by how well we mix jazz musicians and different genres, and I think that’s partly down to the BBC.”
On his Tuesday-night Radio 2 jazz show, Jamie introduces emerging artists to the public, and he wouldn’t rule out doing a similar job on a larger scale by becoming a judge on a reality show such as The Voice UK.
“No one would ever ask me in a million f***ing years,” he laughs. “But I wouldn’t turn my nose up at it – those shows look like fun.”
However, the thought of being on the other side of the judging desk and appearing on Strictly Come Dancing sends Jamie into a panic.
“Oh God, no,” he says.
“I can’t imagine anything worse. The thought has sent me into a tailspin! I’d hate to be centre of attention for anything that isn’t playing music.”
The Biggest Weekend Sat-Mon from 4.30pm, BBC2, BBC1 and BBC4
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