Musician and singers are very creative and artistic individual. They work in myriad locations, both indoors or outdoors, in the United States or even internationally. The musician/singer may be booked to perform in massive concerts or in a small local bar or coffeehouse. Singers usually perform as solo acts or with a band. Many singers and musicians write/compose and perform their own music whereas others "cover" other performers' songs. Musicians/singers who perform in larger venues should be capable of working with a large number of people--from sound technicians to stagehands--and should be comfortable being on stage in front of anywhere from a few to thousands of people. Some musicians/singers may be entirely solo and sign/find their own gigs and performances while other singers and musicians work with an entourage of assistants, managers, coordinators, etc.
No education or certifications are required to become a singer, however, there one can take music lessons and many school courses and private lessons help the singer in defining and bettering his/her voice. The work hours and schedule of singer are completely random, differing on a daily/weekly basis. There will be times when the musician/singer is constantly working, to long periods of no work at all. For this reason, the job of being a musician or singer may be physically demanding at times if they must perform at a number of concerts back to back or maintain high energy levels while only getting small amounts of sleep.