What started as a small experiment in secular, choral-style singing in a North End bar has grown to a city-wide celebration of song. While The Big Sing continues to take over the Company House every second Monday (show up early because it will fill up!), the humble group of shower-singing, music-loving novices have also stormed the stage of Neptune Theatre. Now, their biggest show of all: An opening set for deadmau5 from 5-6pm on The Common. Want to take part? Come by at 3:45 as the group practices a perfectly-on-brand rendition of Bryan Adam’s "Summer of ’69."