J. S. Bach : (Little) Fugue in G minor BWV 578 (organ arranged for Piano):

Johann Sebastian Bach composed a number of stand-alone fugues for Organ, and the G minor one is among the most famous. It was used several times in the recent movie "Glass Onion" serving as the film's main theme. The fugue is catalogued as BWV 578 and sometimes referred to as the "Little Fugue" to distinguish it from other organ fugues in G minor. This arrangement is for piano rather than organ. Although the fugue is in 4 parts, most of the time there are only three parts or fewer playing. It is therefore relatively straightforward to adapt the fugue for piano solo, with only some minor compromises required. Short trills have been replaced by simpler mordents, long trills replaced with sustained notes, and at times some voices have been adjusted by an octave so as not to overstretch the capabilities of the average pianist's hand. However some rolling (or arpeggiation) is required for notes that are still more than an octave apart.

On mfiles there are 3 other versions of this fugue. One of these separates out the 4 voices for clarity and to make it easier to play on a keyboard for example if you don't have access to an organ with manuals and pedals. There is also an arrangement where the 4 parts are played by a woodwind quartet or string quartet, and of course we also have the Original G minor Fugue for Organ.