 His band has always included some of the most talented musicians on the Welsh language music scene, and currently includes Eaves' long-time collaborator, multi-instrumentalist Elwyn Williams, drummer Gwyn 'Maffia' Jones, double bassist Pete Walton and eminent folk musician Stephen Rees, as well as Eaves' daughter, Manon Steffan Ros.The late poet Iwan Llwyd was the band's bassist for some twenty years.Allusions to Christianity, Taoism and left-wing political activism are frequent in his lyrics, the latter a reflection of his earlier involvement in the radical Welsh language movement Cymdeithas yr Iaith Gymraeg and the Welsh Socialist Republican Movement.