''Blood Music'' is a science fiction novel by Creator/GregBear.

Biotechnologist Vergil Ulam creates simple biological computers based on his own lymphocytes ('noocytes'). After his employer orders him to destroy them, Vergil injects them into his own body with the intention of smuggling them out to work on them elsewhere. They attain self-awareness, and HilarityEnsues.
!!This novel provides examples of:
* ApocalypseHow: [[spoiler:Class 1, with the assimilation of North America, plus all the ''interesting'' aftereffects of the nano-civilization slightly breaking reality.]]...[[spoiler: Actually, all the Class-es, Severit-ies and Scope-s by the end of the book (in chronological succession, from smallest to biggest), if you count Humanity becoming a race of [[RealityWarper Reality Warpers]] with perhaps even Multiverse level editing powers as a sub-type of TheEndOfTheWorldAsWeKnowIt trope that is.]]
* ApocalypseWow: [[spoiler:The Earth dissolves into a sphere of noocytes, which combined proceed to break reality to such an extent they then AscendToAHigherPlaneOfExistence, taking the Earth and humanity with them.]]
* AscendToAHigherPlaneOfExistence: [[spoiler:The noocytes have to do this, since their presence is breaking reality.]] [[spoiler:Everybody else too.]]
* AssimilationPlot
* BioAugmentation: Vergil injecting the biological computers into himself. Augmentation indeed...
* BioPunk: To this what ''Literature/{{Neuromancer}}'' is to CyberPunk.
* DeusExMachina: The AscendToAHigherPlaneOfExistence is a case of this.
* EmptyPilesOfClothing: In most cases, the spreading infection assimilates humans almost instantly, leaving only their clothes.
* FictionalCounterpart: Vergil drives into Livermore, California, and passes a Guinevere's Pizza. From the local description, this fictional pizza place is exactly where a Round Table Pizza existed at the time.
* FromASingleCell: [[spoiler:The noocytes are able to encode the squishy chemical versions of people into molecular memories based on DNA/RNA. The noocytes can rebuild and upload the original person -- or an amalgam of all who want to participate -- back into a squishy flesh body should they so wish.]]
* GrayGoo: Pretty much the first story to explore such a catastrophe just a year before K. Eric Drexler's book ''Engines of Creation'' came out.
* LegoGenetics
* {{Nanomachines}}: Technically biological in origin, but on the nano-scale the line between organism and machine is blurry anyway.
* PatientZero: Ulam. He's killed by his friend in a failed attempt to stop the noocyte outbreak.
* RealityWarper: Bear frequently explores the idea that the observer in fact shapes the observed reality. For example, towards the end of ''Blood Music'' the entirety of North America is covered by a biological mass where each cell acts as an individual observer. The sheer concentration of this threatens to cause reality to break apart.
* TheSingularity: [[spoiler:After assimilating most of North America, the new civilization is forced to AscendToAHigherPlaneOfExistence to avoid breaking reality with their sheer awesomeness.]] [[spoiler:They actually 'do' break it..and the Multiverse too.]]
* SyntheticPlague: Oops.
* AnthropicPrinciple: [[spoiler:Of the Very Very Strong kind. Reality itself, in fact, all of the Multiverse, and its non-sapient mind, the Strong AnthropicPrinciple, is built upon increasing the complexity of its structure to fight the final entropy and heat death. One needs to read the book at least twice to get this: Vergil tells, before he dissolves into sentient nano-goop, to his old fiend, that the Noocytes were inevitable and fated to happen. Every government agency, corporation, and the military research complex TRIED to make something even with a fraction of the abilities of the original Noocytes, Vergil says. Only to fail all the time. Why? Because their actions were fueled by the desire to use it as a technology and NOT to boost Reality itself to another level of complexity by creating another higher step in its existence. It seems, in hindsight, that this was Vergil's subconscious desire and motive all along. Later on, a young female survivor of the early stages of the apocalypse in North America, who wasn't turned immediately into nano-goop because she had a one in a billion genetic defect, and later on when the Noocytes figured how to bypass the issue, they already gained gained full sapience and so she was instead offered, if she is willing, a free [[AscendToAHigherPlaneOfExistence Ascension]] train ticket by them, was told by Noocytes that time is very short and that their own scientists caused a yet another Singularity event, like Vergil Ulam, by trying to manipulate sub-atomic scales, the same way Vergil manipulated the molecular make up in his research. At that moment, Reality must have went: [[EvilLaugh MWUHAHAHA]]! JustAsPlanned!]]
* JustAsPlanned: [[spoiler:Reality itself conspired against Humanity since its birth to turn us into agents of its evolution. We were doomed to make the Noocytes in the end.]]