Playing the piano is a great experience. You can be a whole orchestra all on your own, and don't need anyone else to be able to create a complete piece of music.
But solitude can get pretty boring after a while. Someone said that solitude is OK, as long as you have someone to talk with about it later.
Many pianists don't experience the joy of playing with others. But there is something you gain from playing piano duets which you don't get all on your own.
Today my wife, Joan and I have been playing Ulrich and Wittmann's piano duet arrangement of Beethoven's Septet. It was written for clarinet, bassoon, horn, violin, viola, cello and double bass. You may recognise the third movement, because Beethoven also used it in his Piano Sonata, Op 49 No 2 in G Major. This pleasant performance is by musicians from the Verbier Festival Orchestra.
There is a free copy of the piano duet arrangement at the wonderful Petrucci Music Library site.
If you are not in the habit of playing piano duets, you might prefer to start with something easier. Wilhelm Aletter's Four Easy Piano Duets might be a better place to begin.
If you go to the main page of the completely free This is a link to piano duets at the site. Some are labelled as "easy" but "easy is in the fingers of the player" [or is that "mind?"]
I love the scene in Robin Williams' Millennium Man where the robot plays the Berceuse from Faure's Dolly Suite with the little girl.
Katia and Marielle Labèque are sisters who usually play two pianos. Here they are performing Leonard Bernstein's America, from Westside Story.
But perhaps the most enjoyable piano duet is this one from a student concert of the second movement (Andante con cozyta) from P.D.Q. Bach's Sonata Innamorata.