Les is right - there's little evidence of harmony in traditional singing but…the tradition of singing in unison is generally, despite its authenticity, most often misunderstood. So much so that, despite coming from an area where unison is the tradition, the Watersons moved into harmony singing relatively early in their career. However, listen to 'True Hearted Girl' by Lal and Norma or 'Gift' by Norma and Eliza and you'll hear the unison voices which exemplified the singing in Hull pubs in earlier times.