B. Riley believes Tuesday night's New York Post report that Sony Music Entertainment (SNE) is considering acquiring a large stake in streaming music service Rhapsody could be the first step towards a "more realistic" valuation for RealNetworks (RNWK). RealNetworks owns a 43% stake in Rhapsody, B. Riley points out. It believes the current enterprise value for the company includes zero value for its Rhapsody stake. As such, the firm thinks a monetization event for Rhapsody has the potential to drive shares higher by as much as four times. Riley estimates the Rhapsody stake could be worth more than $15 per share alone to RealNetworks shareholders. The firm keeps a Buy rating on the stock with a $15 price target.