Emeli Sande was forced to pull out of Radio 2 Live in Hyde Park after losing her voice.
The 32-year-old singer took to Twitter to apologise to fans, admitting she was "so sorry" about missing out on the London-based show on Sunday (15.09.19), but she had no choice after waking up earlier that morning and her "voice just wasn't there".
She wrote: "I can't believe the situation I am in today. I am so sad to write that I am unable to perform at Hyde Park for Radio 2.
"I have been so looking forward to celebrating the release of my new album with a station and audience that has supported me continuously over so many years.
"I am so sorry for the disappointment caused. I have been singing all week and I woke up this morning and my voice just wasn't there."
The 'Next to Me' hitmaker - who released her latest album 'Real Life' last week - tried everything "in [her] power" to get her vocal cords going again but to no avail, and she promised to make it up to supporters.
She added: "I have tried everything in my power but sadly I have had no success.
"I am so sorry and I promise to find a way to make this up to you all. All my love, Emeli x. (sic)"
While Emeli had to miss out, several big acts did perform to the 40,000-strong crowd, including Westlife, Bananarama, and Clean Bandit.
Pet Shop Boys headlined Radio 2's day of music with a greatest hits-filled set.