Irish Association of Barbershop Singers       Barbershop Harmony Society British Association of Barbershop Singers       Association of Irish Choirs   Choral Public Domain Library       The Association of Gaelic Choirs   Choral Net       21st Century Chorister   Music Encyclopedia (everything about the theory of music)       BUBL Link to Vocal Music (catalogue of internet resources)           Tenortours (news, tour schedules, photographs, etc.  for a selection of Irish artists)