Why would ISIS-K attack a Russian concert?

Hack - A podcast by triple j, triple j

Who is ISIS-K and why did they claim responsibility for an attack on Russia that killed over 130 people? And Tasmania's election has left the state with a hung parliament.  Plus, abandoned tents, rubbish, and single use plastics: what is the solution for festival waste? Guests: Berish Bilander, CEO, Green Music Australia Greg Barton, professor and chair in global Islamic politics, Deakin University