The Ongoing History of New Music debuted in February 1993 on radio station 102.1 The Edge/Toronto. Since then it's...well, it's taken on a life of its own. Consider:   More than 500 different one-hour episodes have been produced, making it the longest-running music documentary in Canada and one of the longest in North America.   More than 5,000 one-minute daily features have been written and produced.   The program is syndicated on virtually every major rock station in Canada.   The Ongoing History of New Music show has spun off four books (all written by Alan Cross), which have worldwide sales of over 30,000 copies, not to mention almost 20 different compilation CDs (including four official Ongoing History discs).