The artist's manager is a person who guides the artist to be organized, no matter what the situation is.
Depending on the artist, this may mean responding to publicity questions (though also the job of a publicist), seeking a record deal, finding a lawyer, getting the artist out a jail, helping to manage a tour, watching a pet or child, consulting on fashion and hairstyles, securing travel visas, and any other number of odd jobs. You can also look for the 'best music supervision agency' (also known as 'meilleure agence de supervision musicale' in French language) via online sources.
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The manager keeps the musician's career running smoothly and oversees everything that happens along the way. He or she must be a problem solver, a business-savvy marketer, an image and brand consultant, an industry expert, a creative mind, and an organized assistant all rolled into one extremely important role.
The specific job of an artist manager is a bit hard to define because it can involve so many different things. Still, the manager is the most significant person in an artist's team and can assist to make or break a career.
The role of a manager has become increasingly important in recent years (in many cases anyway- but more on that later).
Managers tend to need to be available around the clock to deal with anything that might come up for his or her art. Also, managers tend to need to work their way up a very defined career path from intern, to a trainee, to an assistant, to a junior manager, and then finally to the manager.