Signal Cannon is a weekly podcast that delves into the history of a particular sound, song, or form of audio that helped shape pop culture. Whether it’s the inception of video game music or the missing verse of the national anthem, host Billy Donahoe does all the digging you wish you had time to do. Like the signal cannons that were used in the 16th century as a celebratory sound, this show is a celebration of audio in time! Forgotten stories, little-known facts. Humanity over the air.