Los Angeles-based Topspin, the developer of music marketing and merchandising software, has tied its product into online radio platform Earbits, the firm announced Monday. Topspin said that user of Earbits can now see products and offers from Artists via a special tab on Earbits, helping Topspin's clients--artists, labels, and concert promoters--to convert listeners on the radio service into fans and customers. Earbits is an online music discovery service which features independent musicians. No details on the business link between the firms was announced.