We even live in the same city! (but on different coasts)
We should get together and form the world’s shittiest piano duo band. We can call ourselves, How Do You Do B-Minor Again?
I’ve never had a lesson but have been playing since my Madre taught me “Alley Cat” at the age of seven. Have taught myself and played enough over the following decades to impress the hell out of anyone who doesn’t know any better. 
To answer the OP, though, it’s strictly popular stuff. Some of my most recent conquests include “Behind Blue Eyes”, “White Rabbit”, “Morning Has Broken”, and the piano solo part of “Layla”.
I would play every day if I could.
ETA: And virtually every Beatles song, of course.
mmm
This is a good question because it makes me think about how I pick what I play.
The best way to put it is that I play what sticks with me when I hear it.
I’m totally self taught and play by ear. This means I play nothing correctly but many things recognizably 
I’ll occasionally read a tabs page for a new song or something to get the chords straight. The songs I play most can probably be broadly split as shown:
Classic rock radio hits - Too many to list. The last one I picked up was the intro to Come Sail Away by Styx. I don’t do a great job but it always gets a smile when others hear it.
Dance music - Sigh. No use sugarcoating it, I like my corny dance anthems with keyboard samples. Matrix theme, KernKraft 400 (Perhaps NSFW, ladies in bikinis, rated PG), Organ Donor.
Blues - From my head down to my shoes. Easy to learn, impossible to master.
Misc - All the rest. Soaring piano jams like Carly Comando’s Everyday and Usual Suspects theme. I have a few Latin numbers that aren’t terrible. You’d better know Heart and Soul, Pianoman and In-A-Gadda-Da-Vida since everyone will want to hear them.
I played in a loosely structured jam band for a couple years. Not really the kind of music I enjoy listening to but great to play along with and I still play some of those tunes, too.
This post took hours to type out since I was jumping up to play these songs every two minutes while blowing off my responsible obligations I was supposed to do today. Thanks a lot, SDMB. Now who will buy Christmas gifts, get my hair cut and make a grocery run?
Michel Legrand, Scott Joplin, Debussy.
But for sheer impressive fun (and a big finish) you can’t beat Bridge Over Troubled Water. Highly recommended.
I play what ever my mood is.
Moonlight Sonata, Imagine, Faithfully.
If I could do BOTW like the album, I would play it all the time REALLY LOUD!
I generally just make stuff up and connect the ivories.
I took piano lessons from age 4 to 14 and then abruptly stopped, and although I’ve kept playing in the intervening 20 years, unfortunately I haven’t gotten any better than I was at 14. But I still love to play. Mendelssohn, Debussy (particularly the Suite Bergamasque and the Images Oubliees), Brahms (Intermezzo No. 118 in A maj is my favorite of his), and Satie. I also still have my piano books from childhood, and I occasionally trawl the internet for random free sheet music. I am much better at sight reading than playing from memory, so it’s fun for me to have a steady supply of new music to read.
Nerd confession: I recently got the music from Battlestar Galactica, which the composer Bear McCreary transcribed for piano, and I’ve been playing that a lot. I also have the sheet music for the soundtrack to the movie The Piano, which is fun. Schindler’s List. Tori Amos. The Smiths. Um, Depeche Mode.
I’m an intermediate pianist at best. I own way too much sheet music, but I find that I tend to rotate my playing the most among the following:
[ul]
[li]Pretty much anything Bach[/li][li]Two or three “classics” compilations (one of my favorite pieces is Handel’s “Largo” from Xerxes)[/li][li]A book of Vince Guaraldi music[/li][li]A book of Disney music (easy-intermediate)[/li][li]Phantom of the Opera[/li][li]Les Miserables[/li][/ul]
At this time of year I’m also playing Mannheim Steamroller’s “Joy To The World” and stuff out of my old Reader’s Digest Christmas compilation. I have an old choral arrangement of “An Amy Grant Christmas” from my college days, and I enjoy playing the accompaniment. In addition, last Christmas my father showed me an arrangement of “Away In A Manger” that I immediately fell in love with and photocopied (I’ve been playing it all year).
Oh, I also have an a capella SATB arrangement of Billy Joel’s “And So It Goes” that sounds really pretty on the piano, so I tend to play that a lot.
Recently I’ve been making myself practice scales again, and I’m also just starting – barely – to connect my piano playing (which is all about the sheet music) with my jazz singing (which is about improvising). I have Mark Levine’s The Jazz Piano Book, which is kind of a workbook that I use at the piano, and so lately sometimes I do more “work” than simple playing.