Warner Music Group is expected to officially begin trading later this morning on the Nasdaq exchange with its initial public offering carrying a $25 per-share price, which means that the company is realizing an equation valuation of $12.75 billion.That will make it the largest stock offering so far this year, and according to press reports in financial and business news publications, it instills hope among Wall Street traders that the WMG offering will help break the dam and bring forth more