 S. S. Stevens famously argued on the basis of results drawn from psychoacoustic experiments that pitch is not frequency (see, e.g., Stevens et al. 1937, Stevens and Volkmann 1940). In light of similar results, contemporary psychoacoustics researchers commonly reject the identification of pitch with frequency or periodicity. The received scientific view thus holds that pitch is a subjective or psychological quality that is no more than correlated with objective frequency (see, e.g., Gelfand 2004, Houtsma 1995). Pitch, on this understanding, belongs only to experiences. The received view of pitch therefore implies an error theory according to which pitch experience involves a widespread projective illusion.