Radiohead let its fans decide how much to pay for a digital copy of the band's latest release, "In Rainbows," and more than half of those who downloaded the album chose to pay nothing, according to a study by a consumer research firm. Some 62 percent of the people who downloaded "In Rainbows" in a four- week period last month opted not to pay the British alt-rockers a cent. But the remaining 38 percent voluntarily paid an average of $6, according to the study by comScore Inc. Radiohead broke with its past practice of releasing its music in CD format...