“Vespers,” a composition that uses clicks from a sonar device, wasn’t Lucier’s first radically experimental piece, and it wouldn’t be his most famous - that would be ”I Am Sitting in a Room,” in which Lucier recorded himself reciting the technique of the piece, played it back into the room, and recorded the playback. But ”Vespers” - which will be performed at Wesleyan on Saturday night, part of three days of presentations, films, and concerts celebrating Lucier’s 80th birthday - even more provocatively sets out the parameters of Lucier’s music.