Disc jockey is usually an entertainment professional whose job it is to select, very often in a disco or in a club, according to the tastes of the public, the occasions, but also his personal style, various types of musical genres, through an amplification system, with which the room itself is equipped, and to which the console (or disk-console) is connected.
Through this console, with the mixing technique (in English mixing), it is possible to join in sequence several tracks from different sound supports, such as the vinyl record or the compact disc, in order to obtain a single musical flow that is pleasant to all.
The activity carried out by disc jockey, in order to create a mix of sounds in a clear way, is defined with the English term DJing, an activity that requires theoretical-practical knowledge of a musical and electronic nature. A DJ can decide to record a disc containing his live music, his mixes and possibly his productions (in this case, the DJ is also called producer). Especially in recent years there has been a significant increase in DJs, more or less competent, favored by various factors, such as prices on the market for DJs, the advent of digital, record piracy and the most sophisticated CDJ players, which facilitate a lot, compared to their past years.
In the recording studio environment, a sound engineer records, edits, manipulates, mixes, or masters sound by technical means to realize the creative vision of the artist and record producer. While usually associated with music production, an audio engineer deals with sound for a wide range of applications, including post-production for video and film, live sound reinforcement, advertising, multimedia, and broadcasting post-production and mastering.
In larger productions, an audio engineer is responsible for the technical aspects of a sound recording or other audio production, and works together with a record producer or director, although the engineer's role may also be integrated with that of the producer.
In smaller productions and studios the sound engineer and producer are often the same person.
In typical sound reinforcement applications, audio engineers often assume the role of producer, making artistic and technical decisions, and sometimes even scheduling and budget decisions.