A concert is a musical representation played by one or more musicians, singers or instrumentalists. The concert can be free, public or paying. The essential purpose of a concert being to play an audition in front of an audience.
It can be done in completely different environments such as closed rooms, on an outdoor place, a garden see even sometimes in a church.
One can find several styles of music played during a concert: rock music, electronic music, rap, hip-hop, reggae, jazz ...