Pretenders leader Chrissie Hynde is organizing a London tribute concert for Linda McCartney, according to Hynde's spokesperson, Liz Rosenberg. McCartney, wife of ex-Beatles leader Paul McCartney, passed away last April after a long battle with breast cancer. R.E.M. leader Michael Stipe and singer k.d. lang are among the artists Hynde has contacted about the concert, Rosenberg said. The tribute could take place in mid-1999; Hynde, in the meantime, is also working on a new Pretenders album, due this spring.