There's an excellent MIT course for it. All the Lectures on Youtube as well.
https://ocw.mit.edu/high-school/humanities-and-social-scienc...
My favourite bits were a dialogue on the six part ricercar and a piece of music that can shake the player to pieces, it's full of playful but profound little ideas, definitely worth reading.
If you want heavy-but-popular, try Foucault's Pendulum or House of Leaves …
For the gist of it, I recommend I Am a Strange Loop.
The dialogues (Achilles & Turtle) between the "essay" chapters are insanely enjoyable if you like wordplay and divertissement writing. "Crab Canon" is amongst the pages of literature I can re-read ad infinitum.
It gets somewhat harder to follow as it proceeds, and the lack of a "plot" makes it easy to abandon it, but I'd still recommend it.
I'm not sure how well GEB has aged though since it seemed very tied to a particular point in AI history. Has anyone read it recently?