Bertsolaritza or bertsolarism is the art of singing extemporaneously composed songs in Basque according to various melodies and rhyming patterns. Bertsos can be composed at a variety of occasions but are performed generally by one or various bertsolaris onstage in an event arranged for the purpose or as a sideshow, in homage ceremonies, in benefit lunches and suppers, with friends or at a competition. Such a sung piece of composition is called a bertso, the person who sings it is called a bertsolari and the art of composing bertsos is called bertsolaritza in Basque. Traditionally these were sung by men but there is an increasing number of young female bertsolaris today.

A beret is a soft, round, flat-crowned cap, usually of woven, hand-knitted wool, crocheted cotton, wool felt, or acrylic fibre.