The Trad. Index missed some in their note on Billy Barlow (II). American Sheet music from 1836 is at Levy, from two performers. At the Bodleian Library, broadsides from 1818-1829 and on to about 1880 covers the British performers. Sam Cowell is generally thought to be the first in England, but he was only nine years old in 1829, so either the date given for the broadside is wrong, or possibly someone else was first.