A disc jockey (abbreviated D.J. or DJ) is a person who plays recorded music for an audience. Originally, "disc" (sometimes spelled "disk", although this is now uncommon) referred to phonograph records, not the later compact discs. Today, the term includes all forms of music playback, no matter the medium.

There are several types of disc jockeys. Radio DJs or radio personalities introduce and play music that is broadcast on AM, FM, shortwave, digital or internet radio stations. Club DJs select and play music in bars, nightclubs or discothèques, or at parties or raves, or even in stadiums. Hip hop DJs select and play music using multiple turntables to back up one or more MCs/rappers, perform turntable scratching to create percussive sounds, and are also often music producers who use turntablism and sampling to create backing instrumentals for new tracks. In reggae, the DJ (deejay) is a vocalist who raps, "toasts", or chats over pre-recorded rhythm tracks while the individual choosing and playing them is referred to as a selector.[1] Mobile DJs travel with portable sound systems and play recorded music at a variety of events. Some mobile DJs also serve as the master of ceremonies or MC directing the attention of attendees, and maintaining a room-wide focus on what is included in the event's agenda.[2] According to a 2012 study, there are approximately 1¼ million professional disc jockeys in the world.[3]

The title "DJ" is also commonly used by DJs in front of their real names or adopted pseudonyms as a title to denote their profession and the music they play

Deep house was largely pioneered by Chicago producers such as Marshall Jefferson (On The House) and Larry Heard (Mr. Fingers) and with tracks such as "Mystery of Love" (1985) and "Can You Feel It?" and (1986);[1] the latter had a similar impact on deep house as Derrick May's "Strings Of Life" (1987) did on Detroit techno.[2] Heard's deep house sound moved house music away from its posthuman tendencies back towards the lush soulful sound of early disco music (particularly that of old Philadelphia International and Salsoul records).[3]

Later period deep house tracks (1993—94) were more heavily influenced by disco and even merged into a disputable disco house genre.[citation needed] Modern deep house (post-2000) often shares features with the related genre of tech house but tends to focus on musical complexity where tech house focuses on simplicity.[citation needed]

Trance is a genre of electronic dance music that developed in the 1990s in Germany.[5] It is characterized by a tempo of between 125 and 150 beats per minute,[5] repeating melodic phrases,[5] and a musical form that builds up and down throughout a track.[5] Trance is a genre on its own, but also will include other styles of electronic music such as techno,[3] house,[1] pop,[3] chill-out,[3] classical music,[3][4] and film music.[4]

Trance refers to an induced emotional feeling, high, euphoria, chills, and uplifting rush listeners experience. A characteristic of virtually all trance songs is the soft mid-song breakdown,[3][5] beginning with and occurring after the orchestration is broken down and the rhythm tracks fade out rapidly, leaving the melody, atmospherics, or both to stand alone for anywhere from a few seconds to a few minutes. Another common characteristic would be the use of vocals often sung by a female voice ranging from mezzo-soprano to soprano. Less often, the female vocals may be in a grand, soaring, or operatic style, which has been described as "ethereal female leads floating amongst the synths"

Deep house is known for complex melody, use of unrelated chromatic chords underlying most sequences, and a soul, ambient, or lounge vibe to the vocals (if any). It is a style of house music that blends elements of Chicago house, 80s soul, jazz-funk and Detroit techno. Deep house commonly appeared as a genre in the early 90s with more melodic sounds gathering influences from soul, jazz and African beats. In the early compositions (1988–89), influences of jazz music were most frequently brought out by using more complex chords than simple triads (7ths, 9ths, 13ths, suspensions, alterations) which are held for many bars and give compositions a slightly dissonant feel. The use of vocals became more common in deep house than in many other forms of house music. Sonic qualities include soulful vocals (if vocals are included), slow and concentrated dissonant melodies, and a smooth, stylish, and chic demeanor.

Tech house is a subgenre of house music that mixes elements of techno with house music. The term tech house developed as a shorthand record store name for a category of electronic dance music that combined musical aspects of techno, such as "rugged basslines" and "steely beats," with the harmonies and grooves of progressive house.[1][2] The music originally had a clean and minimal production style that was associated with techno from Detroit and the UK.[2] In the mid to late 1990s a scene developed in England around club nights such as The Drop run by Mr.C & Plink Plonk, Heart & Soul, and Wiggle run by Terry Francis and Nathan Coles.[1] Other DJs and artists associated with the sound at that time included Charles Webster, Bushwacka!, Dave Angel, Herbert, Funk D'Void, Ian O'Brien, Derrick Carter, and Stacey Pullen.[1][2] By the late 90's London nightclub The End, owned by the former Shamen rapper Richard West (Mr C) and Layo Paskin, was considered the home of tech house in the UK

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