claim: Backing vocalists sing with the lead vocalist.
evidence: The Murchison River is the second longest river in Western Australia .. Western Australia. Western Australia. It flows for about 820 km from the southern edge of the Robinson Ranges to the Indian Ocean at Kalbarri .. Robinson Ranges. Robinson Ranges. Indian Ocean. Indian Ocean. Kalbarri. Kalbarri, Western Australia. The Murchison-Yalgar-Hope river system is the longest river system in Western Australia .. Western Australia. Western Australia. It has a mean annual flow of 208gigalitres , although in 2006 , the peak year on record since 1967 , flow was 1,806 gigalitres .. gigalitres. Litre#SI prefixes applied to the litre