Some Celtic-pop crossover bands and artists such as Clannad and Loreena McKennitt include folk harps, following Alan Stivell's work. Additionally Florence Welch of Florence and the Machine uses the harp frequently in both Lungs and Ceremonials, notably on "Rabbit Heart (Raise It Up)". The Webb Sisters from UK use different size harps in almost all their material during live performances. Sierra Casady, of the freak-folk group CocoRosie plays harp on several of their songs. Another musician from the UK Patrick Wolf has used the Celtic harp throughout his career, often playing it himself while singing.