Very powerful choral vocals or shouts along with lead singer. It's shouting several statements, frases, words or even sounds. Such things are widespread in hardcore punk, straight edge and youth
crew to pick out the main idea of a song, to appeal audience's attention. Singalons are also present in fusion genres of hardcore punk with
metal (metalcore), death
metal (deathcore), pop punk (easycore). Not to be confused with backing vocals.