The Swedish band Isildurs Bane released their first album in 1984, and continue to the present day with their mixture of progressive rock, jazz, and avant garde music. Original members were Kjell Severinsson (drums), Jan Severinsson (flute, violin), Mats Nilsson (guitar, vocals), Ingvar Johansson (bass), Bengt Johnsson (keyboards), and Dan Andersson (guitar, oboe).
These are photos from concerts where Isildurs Bane played, so they may be of other bands that played the concert as well.