Taking Back Sunday's official discography is mostly accounted for, but the exception is their second EP. I've seen it referenced in a couple of places (including Wikipedia), but coverage has been sparse because no known copies have turned up.
Years ago, someone was able to provide a low quality rip of the title track to YouTube: www.youtube.com/watch?v=0gzNJaSxn7k It's reasonable to assume that this is the same lineup as the first EP; that's unmistakably their original vocalist Antonio Longo, and the other members would remain for the following release (John Nolan on guitar, Adam Lazzara on bass, Eddie Reyes on guitar, and Mark O'Connell on drums).
It was recorded/released in either 2000 or 2001. The format isn't known, though the low quality rip sounds like it's from a 45rpm single. Though it could just be a second generation rip from a bootleg, such as this: www.discogs.com/release/24307388-Taking-Back-Sunday-Taking-Back-Sunday-
Not sure of the background of the release in general; a couple copies of their debut CD have surfaced, but none of this. Maybe it was cut short after Antonio left the band? I've asked Antonio and Eddie on Instagram, but I'm not sure if I'll get through.