In consequence, Foss actively promoted the performance and sought publication of music by Ralph Vaughan Williams, William Walton, Constant Lambert, Alan Rawsthorne, Peter Warlock (Philip Heseltine), Edmund Rubbra and other English composers. In what the Press called "the most durable gentleman's agreement in the history of modern music," Foss guaranteed the publication of any music that Vaughan Williams would care to offer them. In addition, Foss worked to secure OUP's rights not only to music publication and live performance, but the "mechanical" rights to recording and broadcast. It was not at all clear at the time how significant these would become. Indeed, Foss, OUP, and a number of composers at first declined to join or support the Performing Right Society, fearing that its fees would discourage performance in the new media. Later years would show that, to the contrary, these forms of music would prove more lucrative than the traditional venues of music publishing.