Adele is too afraid to headline Glastonbury festival.

The "Someone Like You" singer has been hotly tipped to appear at the event in 2013, but organizer Michael Eavis says he can't convince her because she gets daunted by the number of people who attend the event, held in Somerset, Southern England.

"Adele knows that we want her anyway, but she doesn't want to do anything outside. She comes every year usually and has her own little party, but going on the pyramid stage is a bit daunting, playing in front on 80,000 people, it's a bit much," said Michael Eavis, speaking at the Ivor Novello awards.

Glastonbury is taking a year off to let its fields lie fallow, but when it returns next year, Michael said he's likely to invite Ed Sheeran - who has already performed at the festival a few times and took home Best Song Musically and Lyrically at the awards show - back.