Daniel Berman's masterful arrangement of the Haydn Variations was composed
to commemorate the 100th anniversary of the death of Brahms in 1997.
The intention was to add a major concert work to the Brahms solo piano
repertoire by rewriting the original two-piano version in a version for one piano,
reproducing the original as faithfully as possible while also giving the listener
as much of an illusion of two pianos as two hands could provide. Requires
virtuoso pianism. Duration: 18 minutes. Danber Music (ASCAP).
See a recording at https://www.youtube.com/watch?v=6EP6JExvD4k.

Composer's artist website at danielberman.org.