"Roar" is a song written by Katy Perry, Lukasz Gottwald, Max Martin, Bonnie McKee, and Henry Walter. It was released as the lead single from Perry's fourth studio album, "Prism," in 2013. The song is performed by Katy Perry herself, an American singer, and songwriter. With its empowering lyrics and catchy pop-rock sound, "Roar" quickly became a commercial success, reaching number one on the Billboard Hot 100 chart. Interestingly, Katy Perry wrote the song as a response to personal struggles she had faced. The melody of "Roar" is characterized by a strong, anthemic chorus and a memorable hook that resonates with listeners. The song is predominantly in the key of B-flat major, showcasing Perry's vocal range and delivering a message of empowerment.