According to the Internet source given below, Harry Fox was a Norfolk farmworker and and important singers of traditional English music of the twentieth century due to his large repertoire and fine singing style.
Quoting from the Oxford Dictionary of National Biography:
He is admired for the breadth and variety of his repertory, some 140 items ranging from rough bawdry to high balladry, but above all for his technique, based, according to the BBC producer Francis Dillon, on a carefully placed decoration, a beautifully judged phrasing, an exact control of highly complex rhythm and a singing tone which requires no accompaniment.

Websites:
	Harry Cox	Biography by wikipedia.org