Sveriges Radio P4 was started in 1987 as a network of regional stations, but national programming was added in 1993 when P3 was relaunched as a specialist youth channel and P4 took over a large part of P3's former programming intended for a more adult audience.P4  is a national radio channel produced by the Swedish public broadcaster Sveriges Radio. Targeted at an across-the-board audience, but with the emphasis on older listeners, it is the corporation's most popular radio channel, presenting popular music, entertainment, and sport.