[aimeric]

Aside: I'm glad to see that (so far) no one's referred to it as Krell music.

This is a reference to the 1956 science fiction movie 'Forbidden Planet' (https://en.wikipedia.org/wiki/Forbidden_Planet), which was the first film to use an entirely electronic score, created by husband-and-wife team Louis and Bebe Barron.

The timbres ('electronic tonalities') were generated using rather fascinating vacuum tube circuits. Bebe Barron used these as the basis for her compositions.

The soundtrack superficially appears to consist of weird, unstructured, synthetic sounds. The film's music and sound effects intermingle. But there certainly is a musical structure; it's not just randomly generated sound.

Unfortunately, some electronic musicians generate random sequences or noises and call it 'Krell' music. It's a fundamental (lazy?) misunderstanding of what the Barrons achieved without the use of synthesizers.