Plan B covered Kelis’s ‘Acapella’ during a surprise set at Glastonbury this afternoon (June 26).

The rapper-turned-singer played two songs on the BBC Introducing Stage.

Back by an array of musicians, Plan B - real name Ben Drew - thrilled a small crowd with his cover of Kelis’s recent single.

But, according to Gigwise’s Glastonbury correspondent Charlie Ashcroft, he needed help from his iPhone during the rendition.

“I don’t know the words to this song at all, I’ve got the lyrics on my iPhone - don’t worry though it’s on flight mode,” the rapper said.

Plan B also performed in the East Dance Tent on Friday (June 25).

Gigwise is coming live from the festival all weekend, so keep checking www.gigwise.com for the latest news, photos and interviews.

You can also follow the action on our Glastonbury page, as well as on Twitter and Facebook.