Hi,
the time when Paul Robeson sang to a hall full of Welsh People over the telephone was when he was banned from leaving the US in the 1950s. He was due to sing at a Miner's Eistedfodd in Porthcawl, but was unable to travel. So a telephone lin up was arranged. This took place on 5 Ocober 1957. William Paynter, the Preident of the south Wales National Union of Mineworkers (NUM) said: 'we are happy that it has been possible for us to arange that you speak and sing to us today. We would be far happier if you were with us in person'. The Treorchy Male Voice choir also sang in response. There were 5000 people there, and the recording was released by the NUM. There are five songs on it. It's very good.