Music fan Ciaran McKerrow Dean took part in a jamming session with pop star Ellie Goulding at one of his regular music therapy sessions.
Mr McKerrow Dean, 20, of Watlington, who is autistic and has a learning disability, attends independent music therapy charity Nordoff Robbins in London every week.
Last Monday he was part of a small group who jammed with the singer in a special session.
His mum Karan McKerrow said: “Nordoff Robbins use intensive interaction led by the clients. The clients set the jamming session and the beat, then the pianist, who is the therapist, accompanies.
“They are all about music changing lives and for Ciaran it really has – it has opened up a whole new world for him.”
Although Mr McKerrow Dean, a student at Churchill Park Academy in King’s Lynn, is semi verbal, his mum said he amazed everyone there when he took the microphone and performed a freestyle beatbox rap, with Ellie accompanying on guitar and ukelele.
Ms McKerrow added: “She was so lovely and really sweet, it was amazing.”
Ellie posted on social media: “It was a privilege to visit them to take part in a brilliant music therapy session.”
She said the sessions are guided by skilled musical therapists, who use the power of music to break down barriers, stimulate brain function and uncover new levels of confidence and added: “Pretty amazing stuff.”