Elizabeth "Bess" Cronin was an influential singer of Irish traditional music in the sean-nós style. She sang hundreds of songs which she learnt as a youth, half of which were in the Irish language, which was her first language. She was visited and recorded by prominent collectors of traditional music including Alan Lomax, Jean Ritchie, Peter Kennedy and Seamus Ennis. Some of her songs inspired popular recordings, such as her version of Siúil a Rún, which was covered by Clannad and Celtic Women.

Sean-nós singing is unaccompanied, traditional Irish vocal music usually performed in the Irish language. Sean-nós singing usually involves very long melodic phrases with highly ornamented and melismatic melodic lines, differing greatly from traditional folk singing elsewhere in Ireland, although there is significant regional variation within Ireland. Sean-nós songs cover a range of genres, from love song to lament to lullaby, traditionally with a strong focus on conveying the relevant emotion of the given song. The term sean-nós, which simply means "in the old way", is a vague term that can also refer to various other traditional activities, musical and non-musical.