This has puzzeled me too. I transferred two old LP's on CD and, yes, Gracenotes came up with the tracks. However these LP's may well be available as 'custom' CD's. The only possible information on my CDR's could be track length but that must be very uncertain feature. I also tranferred some - not all - tracks from a series of old LP's: this didn't work. These LP's are not available as CD's but I introduced two variables here. I'll try it again with something else and only one.