21,000 people - just less than 15% of the capacity of Glastonbury Festival - have signed a petition to cancel Kanye West's headline performance at Worthy Farm in June. The controversial rapper was announced this week as Pyramid Stage headliner for the Saturday night, provoking a mixed reaction from fans.

Kanye WestA petition has been launched to stop Kanye West's performance at Glastonbury 2015

Organiser Emily Eavis wrote on Twitter: "We are thrilled to let you know we have the one and only Kanye West headlining Saturday night on the Pyramid stage!"

It prompted a slew of angry responses, with one fan writing, "If Kanye West is headlining glastonbury I'm sending my ticket back. What a shocking shocking idea. He doesn't belong anywhere near it."

More: Kanye West announced as headliner for Glastonbury 2015

A petition titled Cancel Kanye West's Headline Slot and Get A Rock Band reads: "Kanye West is an insult to music fans all over the world. We spend hundreds of pounds to attend glasto, and by doing so, expect a certain level of entertainment."

"Kanye has been very outspoken on his views on music....he should listen to his own advice and pass his headline slot on to someone deserving! Let's prevent this musical injustice now!"

Kanye joins Foo Fighters as headliner for Glastonbury 2015, with Noel Gallagher or Taylor Swift rumored to in talks for the closing slot.

Elsewhere, Lionel Richie will play this year's "legend" slot on the Sunday afternoon. The likes of Florence and the Machine, The Zombies, Hot Chip, Chemical Brothers and Ben Howard are all likely to be announced in the coming months.

The Glastonbury Festival 2015 takes place between June 24-28.

More: Kanye West tells Oxford students: "Obama calls the home phone"