The "St. Anthony Chorale Variations" were originally called "Variations on a Theme by Haydn" but it is now known that Haydn didn't compose the Theme. Brahms created 2 versions of his set of variations: one for Two Pianos (Op.56b) and one for Orchestra (Op.56a), and this is the Theme only for the Two Pianos version. Note that some Piano Duets are labelled as "One Piano, Four Hands" because the 2 players can sit side-by-side at one piano. However this music has a lot of overlap between the two parts, so it needs 2 pianos for a live performance and it is described as "Two Pianos, Four Hands". The sheet music consists of the Two Pianos Score, plus the individual parts for Piano 1 (Primo) and Piano 2 (Segundo). See below for video, mp3, midi and score image.
Other versions of this theme on mfiles include: Orchestra (Brahm's Op.56a version), Piano Solo (Arrangement), and Trio (illustrated on Oboe, Clarinet & Bassoon, but with alternative parts suitable for other instruments).
Here is a video of Brahms' St. Anthony Chorale Variations (Theme) for Two Pianos:
The audio controls below allow you to play the mp3 version of Brahms' St. Anthony Chorale Variations (Theme) for Two Pianos or you can download the MP3 file. You can also download the midi version of Brahms' St. Anthony Chorale Variations (Theme) for Two Pianos.
The image below is the first page of the sheet music, and here you can download the full sheet music for Brahms' St. Anthony Chorale Variations (Theme) for Two Pianos in PDF format.