Do you have perfect pitch, or just good relative pitch?

Absolute pitch is naming or producing a specific note with no reference tone first. Someone with it hears a car horn and says that is an F sharp, or sings a middle C cold. Relative pitch is a different skill, the ability to hear the gap between two notes. Most trained musicians end up with excellent relative pitch and no absolute pitch at all. Genes and early exposure before age 6 both seem to matter. Source: Levitin 1994, Music Perception.

Albert Bachem's 1955 figure of about 1 in 10,000, or 0.01%, in the general Western population is still the one everybody quotes. Prevalence swings wildly by group, though. Diana Deutsch found up to 60 to 65% of Chinese conservatory students showing absolute pitch against roughly 15% of US conservatory students in 2006, a gap that tracks tonal language exposure rather than ancestry. Professional Western musicians sit around 5 to 15%. Source: Deutsch et al. 2006.

Yes, and the way they do it looks different from the real thing. A 2019 study in Cognition found that some adults could name pitches above chance after weeks of training, while their answers stayed slower and less accurate than those of natural possessors and took conscious effort each time. Scoring above chance here says your pitch memory has improved. It does not put you in the 1 in 10,000. Source: Transcription et al. 2019, Cognition.

Partly, and never in a single-gene way. Baharloo et al. (1998) found clear familial clustering, with absolute pitch possessors about four times more likely to have a relative who also had it. Those same families also tended to hand their children early music lessons, which makes the two causes very hard to pull apart. Identical twins match more often than fraternal twins, and a 2007 linkage study flagged a region on chromosome 8. No perfect pitch gene has ever been found. Source: Baharloo et al. 1998, Psychological Science.

In a tonal language such as Mandarin, Cantonese, Vietnamese or Thai, the same syllable said at a different pitch is a different word. Deutsch's 2006 study found conservatory students who grew up with Mandarin or Vietnamese holding absolute pitch at far higher rates than English speakers at the same institutions. The likely mechanism is that early language learning teaches the auditory cortex to attach meaning to specific pitches. Most Mandarin speakers still do not have perfect pitch. Source: Deutsch et al. 2006.

Congenital amusia is a neurodevelopmental condition that makes pitch differences genuinely hard to perceive, and it affects roughly 1.5 to 4% of the population (Peretz and Vuvan 2017). Someone with it may not hear whether a melody rises or falls, or notice a familiar song played in the wrong key. Almost everybody who calls themselves tone deaf has untrained ears instead, and training fixes that. Source: Peretz and Vuvan 2017.

Not on its own. Absolute pitch does a few jobs beautifully, such as tuning without a reference and transcribing by ear at speed. It also causes trouble, because many possessors find transposed music genuinely unpleasant to hear. Improvising, harmonising and playing in an ensemble all lean on relative pitch, which any musician can train to a very high level. History is full of great players who never had absolute pitch. Source: Levitin 2006, This Is Your Brain on Music.

Piano is the research standard because its harmonic spectrum is fairly clean and almost everybody has heard one. Pure sine waves are the alternative, and they sound so unnatural that people do worse on them for reasons that have nothing to do with pitch. There is a cost to the choice. Some possessors have timbre-dependent absolute pitch, naming piano notes easily and struggling on oboe or trumpet, so a piano-only test flatters them. A laboratory assessment would run several instruments. Source: Athos et al. 2007.

Try the room test. If someone presses a random piano key next door and you can name it straight away, that is absolute pitch. Needing a note first, or working it out from the distance to something you already know, makes it relative pitch, and it is what most trained musicians have. Watch for the middle case as well. A guitarist who always recognises the open A string has memorised one timbre at standard tuning rather than acquired absolute pitch, which is why this test runs 20 tones instead of one.

Mozart is the standing example, able to name notes by ear as a small child and reportedly distressed by out-of-tune instruments. Historical accounts credit Bach with the same ability, and Beethoven is thought to have had it before his hearing went. Among later musicians, contemporaries reported that Jimi Hendrix could tune to concert pitch without a tuner, and producers have long said the same of Mariah Carey, with Frank Ocean self-reporting it. Orchestra principals hold it often enough that nobody remarks on it, and gifted composers without it are just as common.

The odds go up sharply with early exposure, and no combination guarantees it. Linkage work points at regions on chromosome 8q24 in families where the trait runs (Theusch et al., 2009), so some children start with a lower threshold than others. What decides whether the threshold gets crossed is what reaches their ears before school age, which means a tonal language at home or serious music training inside the critical period. Predisposition without that environment usually goes nowhere, and the environment without much predisposition produces good pitch memory rather than the real thing.