Radiohead’s pay-what-you-want move — which was an undeniable success, if only for the amount of free publicity it garnered the group — is just one of many innovative ideas being tried out by bands, record labels and others in the music biz. Some are hopelessly mired in last-century thinking, but smart concepts are bubbling up as the music industry struggles with the death of the CD and the increasing irrelevance of old ways of doing business.