The Beatles - I Am The Walrus - Isolated Electric Piano + Guitar 

I believe the piano used was a Hofner pianet, but even the gear maniac band The Analogues don't have quite the same effect with the same instrument ; I hear a bit of chorus myself

@@rbstems ah okay. What’s meant by chorus? Some sort of effect?

Yes chorus is an effect : if you don't know what it is well the most notable example of chorus I can think of is Come as You Are by Nirvana

@@Mason-zt6mu I know a lot of people say it's a Pianet, but I think it may be a Wurlitzer electric piano. If you listen to Logical Song by Supertramp, it has a similar sound. As far as chorus, that's when the sound is doubled, but slightly detuned, producing the effect you hear.

Could it be played through a Leslie speaker?