Gareth Farr (photo by Gareth Watkins)On Tuesday, composer Gareth Farr talks about Kaitiaki for voices and orchestra, a collaboration with Witi Ihimaera to be performed by the NZSO; Shelley Brunt introduces the 13th annual Chicago World Music Festival; and Tecwyn Evans on conducting the Southern Sinfonia's "Last Night of the Proms" concert this Thursday.