I agree. Harry Cox, Phil Tanner, Sarah Makem EliZabeth Cronin, Margaret Barry, Joseph Taylor,JeannieRobertson, these could all be required listening for an examination. It doesnt mean that they have to be copied exactly, but used to expose children      and others to certain types of singing. this is exactly what I did when I started singing, as I know Martin did too. the same could be done on the instrumental side, Jinky wells, Stephen Baldwin,Oscar Woods, Billy Bennington, Billy Pigg. marks not to be given for copying someone exactly, but for some influence in style. Although copying someone exactly is not necessarily bad if its used as a stepping stone rather than a final goal, some people have achieved a style of their own by taking certain things from two or three traditional performers.creating their own hybrid.