A Canadian music festival called Hi-Fi Musical Adventure has been cancelled, following one of its co-founders posting offensive remarks about the American singer Kesha.

Anthony Dell'Orso reportedly posted on Facebook: "F**k Kesha. Talentless hack with a penchant for drama," but it has since been deleted via Billboard.

Dell'Orso has apologised for his comments, saying: 

"What Kesha is going through is horrible and the deal that she signed is a form of slavery. I never meant to make light of the situation having to do with the allegations surrounding her and Dr. Luke. I did a stupid thing posting what I did in the first place and the events that followed. 

I do have the biggest respect for women in this world and particularly in the music industry. I've seen first hand how they can be treated.

In October 2014, Kesha filed a lawsuit alleging "mental manipulation, emotional abuse and sexual assault" at the hands of the producer, Dr. Luke, who first worked with her ten years ago.

Kesha was asking for an injunction that would release her from Dr. Luke's contract, but the case didn't result in her favour and the judge ruled against her."

There has been an outpouring of love and support for Kesha ever since, with the hashtags #FreeKesha and #FreedomForKesha trending and many celebrities speaking out in shock on Twitter.

Lady Gaga has been a continual supporter, posting photos of her and the singer online.

Gaga recently said: “What happened to Kesha has happened to many female artists including myself. It will affect her for the rest of her life.”

Lily Allen tweeted: "My thoughts are with @KeshaRose today. I'm sorry you've had to endure this experience."

'Ghost' sensation Halsey also posted a tweet about the outcome of the case, writing: "Disgusted by anyone in power positions abusing their authority. My heart breaks for Kesha and all people affected by this toxicity. F**k. I don't even know what I would do... I only hope she can find peace and find a way to continue to create express herself without fear."

Lorde tweeted: "Standing with @KeshaRose through this traumatic, deeply unfair time. send good vibes her way everyone."

Alessia Cara added: "Really disappointing to hear about this kesha case. no one should be denied freedom from their abuser, nor freedom of their creativity."

Taylor Swift gave Kesha $250,000 (£175,000) to help fund her court battle with Dr. Luke.

More recently, the British superstar Adele mentioned her during her acceptance speech at The Brit Awards.

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Watch videos on Kesha's court trial and Lady Gaga's relevant Oscar-nominated song, below: