Def FX are an Australian industrial-dance-rock group, formed in Sydney. The core of the group was Sean Lowry (also a visual artist & writer), Fiona Horne (vocalist and lyrics) and Martyn Basha (bassist and co-writer).Top 50 ARIA hit "Psychoactive Summer" is exemplary of Def FX's music, combining elements of electronica and heavy-metal instrumentations and grunge vocals.