Paul McCarney is one of the most popular artists on Japan-based communication app Line, with 10.7 million followers in total - more than all of his Facebook and Twitter followers combined.

And McCartney has now become the first Western artist on the platform to sell a series of ‘sound stickers’, which users can paste within conversations.

The sound stickers have been recorded in Japanese and English and were released to correspond with his latest Japanese tour.

“A few weeks ago, ...