There is no official lead singer. They are a boy and after all but Max tends to sing the most although it is constantly changing throughout the songs. Hope this helps.
In the band heir is no lead singer they all work together to make wonderful amazing music we can all apperciate and love for life. I hoped that helped.
It depends on what song it is. For instance, Warzone, Nathan; Glad you came, Max. They all have a major part on each song, but they all still sing. It wouldn't be fair for a lead singer, they all work together as a big family.