Inside the Dream Syndicate, Vol. I: Day of Niagara or simply Day of Niagara is a bootleg recording of a 1965 performance by the minimalist music group the Theatre of Eternal Music, a.k.a. the Dream Syndicate. Contributors include future Velvet Underground members John Cale and Angus Maclise, composers La Monte Young and Tony Conrad, and artist Marian Zazeela. It received a release in 2000 by the label Table of the Elements against the wishes of Young.