Live performance or concert
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. A concert held in a very 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. An attendee will probably see the musicians perform again if the concert was worthwhile. Recording artists usually go on tours to promote record sales and introduce their fans to new musical compositions. Some musicians and musical groups are known for consistently touring and holding concerts, others rarely so.

Benefit Concert
A benefit concert or charity concert is a concert, show or gala featuring musicians, comedians, or other performers that is held for a charitable purpose, often directed at a specific and immediate humanitarian crisis. Such events raise both funds and public awareness to address the cause at issue.
Benefit concerts typically feature popular performers working for little or no pay. The largest such effort in recent memory was the multi-venue Live 8 concert organized in 2005 by Bob Geldof and Bono,and the Live Earth concerts organized by Al Gore and Kevin Wall on 07/07/07 who have been involved in several other similar events. [1] [2] Benefit concerts were also arranged following the September 11, 2001 attacks, the 2004 Indian Ocean earthquake and Hurricane Katrina.
There are various ways by which additional revenue and awareness for the charitable cause is raised - over and beyond the original event. These methods have included theatrically-released concert films, live television, radio and internet broadcasts, audio recordings and home video releases of performances.

What does the UN mean by "youth"
What does the UN mean by "youth", and how does this definition differ from that given to children?
The United Nations, for statistical purposes, defines ‘youth', as those persons between the ages of 15 and 24 years, without prejudice to other definitions by Member States. This definition was made during preparations for the International Youth Year (1985), and endorsed by the General Assembly (see A/36/215 and resolution 36/28, 1981). All United Nations statistics on youth are based on this definition, as illustrated by the annual yearbooks of statistics published by the United Nations system on demography, education, employment and health.
By that definition, therefore, children are those persons under the age of 14. It is, however, worth noting that Article 1 of the United Nations Convention on the Rights of the Child defines ‘children' as persons up to the age of 18. This was intentional, as it was hoped that the Convention would provide protection and rights to as large an age-group as possible and because there was no similar United Nations Convention on the Rights of Youth.
Many countries also draw a line on youth at the age at which a person is given equal treatment under the law - often referred to as the "age of majority'. This age is often 18 in many countries, and once a person passes this age, they are considered to be an adult. However, the operational definition and nuances of the term ‘youth' often vary from country to country, depending on the specific socio-cultural, institutional, economic and political factors.