Another composer I enjoy is John Cage. He experimented a lot with indeterminacy, chance and unconventional musical modes. Some of his music is so dissonant it’s a little hard to listen to.
I particularly like his composition “In a Landscape” though: it’s very pretty.
One of his pieces, 4:33 is just 4 minutes and 33 minutes of silence, which is kind of ridiculous on the one hand but also makes us think about music as being a play of sound and silence, presence and absence.
Bearer of Pity 