Live music, Concert tickets, CD sales
Live music - A concert is a live performance, usually of music, before an audience. The music may be performed by a single musician, sometimes then called a recital, or by a musical ensemble, such as an orchestra, a choir, or a musical band. Informal names for a concert include "show" and "gig". Concerts are held in a wide variety of settings or venues, including pubs, nightclubs, houses, barns, dedicated concert halls, entertainment centres, large multipurpose buildings, and even sports stadia. An indoor concert held in a large venue is sometimes called an arena concert. Regardless of the venue, musicians usually perform on a stage. Before the dominance of recorded music, concerts would be the only opportunity one would generally have to hear musicians play.
While the principal reason for a concert is the opportunity for the musicians to perform in front of an audience, even the most purely artistic of endeavors will see gains. Concerts provide the musicians exposure to the public.

Concert tickets - A concert is a live performance, usually of music, before an audience. The music may be performed by a single musician, sometimes then called a recital, or by a musical ensemble, such as an orchestra, a choir, or a musical band. Informal names for a concert include "show" and "gig". Concerts are held in a wide variety of settings or venues, including pubs, nightclubs, houses, barns, dedicated concert halls, entertainment centres, large multipurpose buildings, and even sports stadia.
While admission to many concerts is free, it is common practice to charge money for admission to concerts by selling admission tickets. Revenue from ticket sales traditionally goes to the performing artists, producers, and organisers. In the case of benefit concerts, a portion of profits will often go towards charity.
Admission to a journey or other event or establishment may be subject to paying an entrance fee / buying a ticket. CD replication - Compact disc manufacturing is the process by which commercial compact discs (CDs) are replicated in mass quantities using a master version created from a source recording. This may be either in audio form (CD-Audio) or data form (CD-ROM). This process is used in the mastering of read-only compact discs; CD-Rs, CD-RWs, and DVDs are made somewhat differently, though the methods are broadly similar.
A CD can be used to store audio, video, and data in various standardized formats defined in the Rainbow Books. CDs are usually manufactured in a class 100 (ISO 5) or better clean room; they can usually be manufactured to quite strict manufacturing tolerances for only a few US cents per disk.
CD mastering differs from burning, as the pits and lands of a mastered CD are moulded into a CD blank, rather than being 'burn marks' in a dye layer (in CD-Rs) or areas with changed physical characteristics (in CD-RWs). In addition, CD burners write data sequentially.