Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. XHPRS-FM or 105.7 The Walrus is a commercial oldies radio station in Tecate, Baja California, broadcasting to the Tijuana-San Diego metropolitan area on 105.7 FM. From 2006 to 2008, this station simulcasted XEPRS-AM as XX (pronounced Double X) Sports Radio. It aired San Diego Padres games and the entire talk show lineup from the AM station. Before that, it had various musical formats. When XX Sports Radio aired on FM, it helped spread the XEPRS signal to eastern parts of San Diego County. Oldies is a term commonly used to describe a radio format that concentrates on a period 15 to 55 years before the present day. In the 1980s and 1990s, "oldies" meant the 15 years from the birth of rock n roll to the beginning of the singer-songwriter era of the early 1970s, or about 1955 to 1972. Oldies music is sometimes synonymous with classic rock music.