In music, the word unison can be applied in more than one way. In general terms, it may refer to two notes sounding the same pitch, often but not always at the same time; or to the same musical voice being sounded by several voices or instruments together, either at the same pitch or at a distance of one or more octaves; or to rhythmic patterns which are homorhythmic.

Unison (also called a "prime") may refer to the (pseudo-)interval formed by a tone and its duplication (in German, Unisono, Einklang, or Prime), for example C–C, as differentiated from the second, C–D, etc. In the unison the two pitches have the ratio of 1:1 or 0 half steps and zero cents. Although two tones in unison are considered to be the same pitch, they are still perceivable as coming from separate sources, whether played on instruments of a different type:  play unison on C, piano and guitar (help·info); or of the same type:  play unison on C, two pianos (help·info). This is because a pair of tones in unison come from different locations and/or can have different "colors" (timbres), i.e. come from different musical instruments or human voices. Voices with different colors have, as sound waves, different waveforms. These waveforms have the same fundamental frequency but differ in the amplitudes of their higher harmonics. The unison is considered the most consonant interval while the near unison is considered the most dissonant. The unison is also the easiest interval to tune. The unison is abbreviated as P1.

Porter Robinson (born July 15, 1992) is an American electronic dance music producer and DJ from Chapel Hill, North Carolina. He primarily produces in the electro house genre. He also named the genre complextro when he created the portmanteau to describe his own sound.

Porter Robinson began producing at the age of 13 using Sony ACID Pro emulating sounds he heard from video games. He later began producing hands-up under the alias Ekowraith using FL Studio. It was at this time that Robinson became friends with a young Madeon, who was also producing hands-up under the name Deamon, and also using FL Studio.

Robinson primarily uses Lennard Digital Sylenth1, Native Instruments Massive, 3xOsc, Sytrus and several other commercial and free audio plugins.

He is currently 19 years old and recently graduated high school in his hometown of Chapel Hill, North Carolina.

He has released a variety of original singles on Glamara Records and Big Fish Recordings. His first single, "Say My Name", was an enormous success, landing at #1 on Beatport's Electro House chart. In the summer of 2011 he signed with OWSLA, a new label operated by Skrillex, to release his first EP entitled Spitfire. Spitfire reached the number one spot on the iTunes Dance chart as well as the number one spot on Beatport's overall release chart.