Four months after the release of his comeback LP Syro and days after a revelatory new EP appeared online, it looks like Aphex Twin is again releasing unheard music. On an anonymous Soundcloud account, there are over 70 tracks of music that sounds uncannily like Richard D. James' early, clubby and ambient work—and there's good reason to believe that James is the one uploading it.

The trove of music began appearing Sunday on a now-defunct Soundcloud page called user487363530, and since then, whoever's behind it has moved through a succession of similarly titled free accounts—probably to skirt the site's limit on unpaid uploads. The current incarnation, user48736353001, is a premium account with unlimited storage, so it's safe to hope the mystery uploader will camp out there for a while. "Fork Rave," the latest track, was added just 15 minutes before I wrote this.

Why believe that James is behind the uploading spree? There are the aesthetic cues, and James told Pitchfork in an interview after his reemergence that he has "thousands" of records of unreleased stuff that he'd like to release. Many of the tracks are tagged with "aphex" and "afx," two of the musician's many aliases, and he's always been coy about the authorship of his own music. More compelling than any of that, however, are a testimonial from a friend and collaborator and the sleuthing of the internet's nerdiest Aphex fans.

Pitchfork's Philip Sherburne explains:

Planet Mu founder Mike Paradinas—a.k.a. Mu-Ziq, who collaborated with James on the Mike & Rich project—vouched for the authenticity of the material on Facebook, saying that he recognized some tracks from James' old tapes; he also identified a tune called "Symbonsad" as being previously released on the ART label, although he didn't specify which release, and he picked up on a striking resemblance between "1 Chink 101" and another tune, sometimes known as "Hexagon", released on Aphex Twin's totemic Selected Ambient Works Volume II. And various [Aphex fansite] WATMM super-sleuths have turned up plenty of evidence supporting James's authorship, like the appearance of the track titled "8 Utopia" in Aphex Twin's 2010 performance in Barcelona (some seven minutes into this video).

Many of the uploads are clearly sketches and demos, but plenty are fully fleshed-out compositions. With the caveat that there are dozens of tracks I haven't yet listened to, a few highlights are below.

It's not surprising that in 2015, James would turn to Soundcloud for a project like this. Something about the social, freewheeling nature of the platform lends itself to informal releases, and recently, producers from Giorgio Moroder to Johnny Jewel have used it when opening their vaults.