MUSICAL JOURNEY An autograph signing event to celebrate the launch of Po Po Book will take place tomorrow from 4.30pm to 6pm at the Multi-purpose Court, SportX, Ocean Terminal in Tsim Sha Tsui. Po Po means 'embrace' in Chinese. Last year, a group of local pop singers and independent musicians set out for a journey in London to demonstrate the Po Po spirit through a cultural exchange and recording a salsa-flavoured song. The book records highlights from the UK trip, giving readers the chance to experience their unforgettable journey. Music educator Wong Chi-chung and his wife Yvonne Siet will be hosts of the event. A group of Po Po artists including At 17, Ketchup, inLove and Ghost Style will be on hand to sign copies for the book. Proceeds from sales of the book will go to the Cathay Pacific Wheelchair Bank to buy wheelchairs for children with neuromuscular diseases. ENCORE PERFORMANCE Canto-pop star Leo Ku Kui-kei - who performed a series of sell-out concerts last month - will take centre stage again at the Hong Kong Coliseum from Wednesday to Saturday at 8.15pm. The 32-year-old crooner is billed as one of the new four kings of Canto-pop. Tickets for his last set of concerts sold out within a few days. Tickets at $400, $200 and $100 available from Urbtix on 2734 9009. Monday, April 4 On this day 1968: U.S. civil rights leader Martin Luther King was assassinated on the balcony of a Memphis motel 1884: Bolivia ceded Atacama to Chile under the Treaty of Valparaiso 1912: A Chinese republic was proclaimed in Tibet 1979: Former president of Pakistan Zulfikar Ali Bhutto was hanged at Rawalpindi for conspiring to murder a political opponent 2004: Thousands of supporters of the militant Shia cleric Muqtada al-Sadr rose up against U.S.-led occupying forces in the IRaqi cities of Baghdad, Najaf, Kufa and Amara