This morning, in a loft in Shoreditch, 7Digital announced that their digital music catalogue is to become 100% free of DRM. The last holdout among the major labels - SonyBMG - has bowed to consumer demand and agreed to sell its catalogue of 250,000 tracks in MP3 format, as opposed to the restricted WMA format. Even better, all SonyBMG tracks that customers have previously bought will be upgraded to MP3s at no cost. All MP3s are at 320kbps quality...