WATCH: Rock icon Patti Smith leads Glastonbury festival crowd singing 'Happy Birthday' to Dalai Lama
Patti Smith, Dalai Lama at Glastonbury 2015 - BBC screenshot

The crowd at the 2015 Glastonbury music festival went crazy on Sunday as the Dalai Lama gave a speech about happiness while sharing the stage with American rock icon Patti Smith.

Prior to addressing the crowd, Smith presented the exiled Tibetan leader with a birthday cake before leading the crowd in a rousing version of "Happy Birthday."

The cake and song came early for the spiritual leader who turns 80 on July 6.

In his speech, the Dalai Lama called violence in the world "Unthinkable."

“In this very moment, in some part of the world, like Syria, Iraq, Nigeria and some other places they’re killing, human to human being. Unthinkable," he said. "And the worst thing [is] conflict, killing each other, in the name of their faith. Unthinkable.”

“There is no basis to kill. I love my own life. Everyone loves their own life. Everyone has the right to live happily. Once you have a firm conviction in that, then suddenly man-made problems will reduce.”

Despite being a hard act to follow, American pop star Lionel Ritchie took the stage afterward.

Watch the video below from the BBC: