Jobless claims rise amid uneven market ECONOMYJobless claims rise by 4,000More Americans than forecast filed applications for unemployment benefits last week, a sign improvement in the labor market remains uneven. ONLINE MUSICAmazon to offer MP3s of CDsAmazon.com, the largest online retailer, will offer users free digital copies of CDs bought on its site, as it competes with Apple and Google to attract music lovers choosing to store their songs on the Web. After the transactions are completed, Sam Duncan, the former chairman and chief executive officer of OfficeMax Inc., will become CEO of Minnesota's Supervalu, replacing Wayne Sales, the companies said. MOBILE PHONESNokia stock up as earnings riseNokia jumped as much as 18 percent in Helsinki trading after a surprise fourth-quarter earnings recovery signaled Chief Executive Officer Stephen Elop's plan to revive the Finnish handset maker is gaining pace.