Pink Floyd's final studio offering is a resurrection of ideas abandoned in 1994, when The Division Bell was edited down to a single album from earlier plans for a double: lyrical songs on one disc, instrumentals on the other. Traditional songs won out and the ambient scraps went to the archive, a casualty of band apathy, yet soon to spawn Internet rumors such as the April Fool's joke of 1997: a surprise release entitled Liquid. Which, dated jibe against Roger Waters aside, still wouldn't...