The late 1980s also saw the emergence of Yellow Dog, a label specialising in Beatles studio outtakes, who released the CD series "Unsurpassed Masters" in quality similar to "Ultra Rare Trax"; Yellow Dog, like Swingin' Pig's parent company Perfect Beat, was registered in Luxembourg, which had the most liberal copyright laws among EU countries. Yellow Dog released "Unsurpassed Demos" in 1991, featuring 22 songs from the 1968 Kinfauns (Esher) demos, only some of which had been previously made public during the radio series "The Lost Lennon Tapes" that debuted in 1988.