“Ad Libitum” is a Latin phrase that means “at pleasure, at will” and is used in legal language, Catholic liturgy, politics, and also in music, to refer to decisions that are made “at piacere”. In this case, it is a concert that breaks with convention and reinterprets great works of classical music with unconventional instruments such as the Tripticófono Tuboidal, the Serrucho Tenor, the Vidriolín or the Vidrioncello Copodivarius. A mischievous, didactic and highly entertaining offering, dedicated to all people, young and old, who are not satisfied with how normal things are, and enjoy the eccentric.