They' refers to the group known as 'That Group'. This group is a collection of musicians and artists who have come together to create music and other forms of art. The group was formed in 2018 and has released several albums and EPs since then. Their style of music is a mix of pop, rock, hip-hop, and electronic elements. The group has gained popularity through their live performances and social media presence. They have also collaborated with other artists and have been featured on various radio stations and television programs.