1 / 4   At the upcoming Sydney music festival, which lasts from Jan. 6 to 28, music lovers can see Between Music, the world’s first underwater band. /VCG Photo

2 / 4   The Danish ensemble features five performers who submerge themselves in transparent water tanks before play custom-made instruments and singing while entirely underwater. /Facebook Photo

3 / 4   This unique musical group began when the lead singer and composer Laila Skovmand decided to find a way to sing underwater. After a series of trials and errors, Skovmand developed a technique that involves holding an air bubble in her mouth and singing through it while in the water. /VCG Photo

4 / 4   Spurred on by her success, the artist spent a decade  experimenting with divers, instrument makers and scientists to make instruments that work underwater. /VCG Photo