About A Gallery To Play To: In the summer of 1967, Tony Richardson of Penguin Books took a chance. Then its Poetry Editor, he devoted number ten of the highly prestigious Penguin Modern Poets series to three unknown and relatively unpublished young writers from Liverpool. The book, featuring Adrian Henri, Roger McGough and Brian Patten, would have its own generic title, The Mersey Sound, and would be something of a leap in the dark. It would be a big break for the three writers. The print run, as large as twenty thousand, would guarantee status, and steady sales were expected over the next ten years. Within three months it had sold out. The rest, as they say &