A spectrogram is a time-varying spectral representation (forming an image) that shows how the spectral density of a signal varies with time. Also known as spectral waterfalls, sonograms, voiceprints, or voicegrams, spectrograms are used to identify phonetic sounds, to analyse the cries of animals; they were also used in many other fields including music, sonar/radar, speech processing,seismology, etc. The instrument that generates a spectrogram is called a spectrograph.

The most common format is a graph with two geometric dimensions: the horizontal axis represents time, the vertical axis is frequency; a third dimension indicating the amplitude of a particular frequency at a particular time is represented by the intensity or colour of each point in the image.

There are many variations of format: sometimes the vertical and horizontal axes are switched, so time runs up and down; sometimes the amplitude is represented as the height of a 3D surface instead of color or intensity. The frequency and amplitude axes can be either linear or logarithmic, depending on what the graph is being used for. Audio would usually be represented with a logarithmic amplitude axis (probably in decibels, or dB), and frequency would be linear to emphasize harmonic relationships, or logarithmic to emphasize musical, tonal relationships.

Richard David James (born 18 August 1971), best known under the pseudonym Aphex Twin, is a British electronic musician and composer. He founded the record label Rephlex Records in 1991 with Grant Wilson-Claridge. He was described by The Guardian as "the most inventive and influential figure in contemporary electronic music."

Aphex Twin has also recorded music under the aliases AFX, Blue Calx, Bradley Strider, Caustic Window, DJ Smojphace, GAK, Martin Tressider, Polygon Window, Power-Pill, Prichard D. Jams, Q-Chastic, Tahnaiya Russell, The Dice Man, Soit-P.P., and speculatively The Tuss.

Aphex Twin has released recordings on Rephlex, Warp, R&S, Sire, Mighty Force, Rabbit City, and Men Records.

Richard David James was born to Welsh parents Lorna and Derek James in St. Munchin's Limerick Regional Maternity Hospital, Ireland. He grew up in Lanner, Cornwall, enjoying, along with two older sisters, a "very happy" childhood during which they, according to James, "were pretty much left to do what [they] wanted." He "liked growing up there, being cut off from the city and the rest of the world". James attended Redruth School, located in Redruth, Cornwall.

Andrea Jean James (born January 16, 1967) is an American writer, film producer and director, and transsexual LGBT rights activist.

James grew up in Indiana and attended Wabash College, a liberal arts college, where she majored in English, Latin and Greek. After graduating in 1989, she obtained a Master's degree in English language and literature from the University of Chicago. After her MA, James wrote ads for Chicago advertising agencies, working in the business for ten years. The experienced encouraged her to become involved in consumer activism, with a particular interest in medical and academic fraud.

In 2003, together with author and entertainer Calpernia Addams, she co-founded Deep Stealth Productions to create content by and for transgender people. She is the host of the instructional program, Finding Your Female Voice. She produced and performed in the first all-transgender cast of The Vagina Monologues in 2004, debuting a new piece created by Eve Ensler for the occasion. She was also a consultant on and appeared in Beautiful Daughters, a documentary film about the event.