What does the bertso have to catch the public so much? Throughout the world there are several cultures that work with oral improvisation, but none of them has the strength that bertsolaritza has today. Proof of this is the Bertsolaris Championship that is held every four years in the Basque Country –this year it is being held a year late due to the pandemic–. A championship in which, after several play off sessions throughout Euskal Herria, eight bertsolaris usually reach the grand final. These eight improvisers must sing before fourteen thousand listeners more or less, in morning and afternoon performances. Through the media many other listeners follow the act. Experts from all over the world are also approaching a broadcast of this magnitude. But I think the most shocking thing is the almost liturgical silence that occurs before the bertsolaris begin to sing. Those fourteen thousand throats are suddenly silent, completely, to give expression to a single throat. That unique thread of voice, through improvised words in Basque, weaves thousands of hearts in seconds, makes thousands of skins vibrate, moistens thousands of eyes, provokes thousands of laughs… Where is the secret of this magical fact?