Shares in online music retailer Napster Inc. gained more than 11 percent Monday after the Los Angeles-based company was upgraded by Bear Stearns Cos., saying the stock, based on the valuations, is now a bargain, analyst Kunal Madhukar said in a report. Napster reported a $2.8 million loss (-6 cents per share) last week beating handily Wall Street’s expectations of a 12-cent-per-share loss. Shares in Napster were at $1.81 in early trading Monday.