Cimorelli /sɪməˈrɛli/ is a singing group that first gained popularity on YouTube singing cover music. They were subsequently signed to Universal Music's Island label. Now composing and writing their own songs, Cimorelli is made up of six sisters: Christina, Katherine, Lisa, Amy, Lauren, and Dani. Their music is mostly made up of a cappella singing with occasional instruments. As of August 2016, the group has released five extended plays, a mixtape called Hearts on Fire, and a full-length album titled Up At Night.