以斯德哥爾摩電話區碼為名的ZERO8，是一支來自瑞典的男聲合唱團，以無伴奏演唱為基礎，結合不同的爵士和聲變化，呈現男聲理髮廳合唱特有的聲響。他們擁有出色的和聲技巧與音樂表演能力，擅長以理髮廳合唱詮釋世界流行金曲，也嘗試以傳統男聲合唱演繹經典北歐曲目。在指揮克里斯特隆的帶領下，ZERO8曾斬獲多項國際合唱大賽獎項，包括2022年瑞典歐洲理髮廳合唱大賽總冠軍、2023年斯洛維尼亞馬里博爾國際合唱大賽的總冠軍。

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It all started in 2007 when a group of young men from Stockholm's Music Gymnasium discovered the genre of barbershop and went to the Nordic barbershop convention to explore further. There they met international barbershop quartet champion Doug Harrington, an American now living in Sweden, and after a few meetings and discussions Zero8 was formed. The ambition was to create a men's choir that not only performed barbershop on a high level, but also to bring that perfection of sound and showmanship element that barbershop is known for into many other genres. The choir also has roots in classical choral singing as many members studies or studied at Stockholms Music Gymnasium. Doug Harrington founded, led and directed the choir until late 2015 when versatile musician Rasmus Krigström took over. Rasmus is a director, arranger, composer, singer and international barbershop championship gold medalist in 2012 with Ringmasters.