Cicada Insect & It's Weird Call

This is a cicada insect with a very strange mating call. I heard it in the Jungle in Thailand a few years ago, in a National Park called Khao Sok. I did a jungle trek for 4 days, sleeping in hammocks and eating out of bamboo plates. At the end of the afternoon all the species of cicada would broadcast their mating call. The strange thing is, one species starts up and has their 10 minutes, then another pipes up, and the whole effect is really wierd to say the least!