Atelier is the French word for "workshop", and in English is used principally for the workshop of an artist in the fine or decorative arts, where a principal master and a number of assistants, students and apprentices worked together producing pieces that went out in the master's name. This was the standard way of working for European artists from the Middle Ages to the 18th or 19th century, and common elsewhere in the world. In medieval Europe such a way of working was often enforced by local guild regulations, of the painters' Guild of Saint Luke if there was one, and those of other guilds for other crafts. Apprentices usually began young, at perhaps the age of twelve, working on simple tasks, and after some years became journeymen, before perhaps finally becoming a master themselves. The system was gradually replaced as the guilds declined, and the academy became considered a superior method of training, although many artists continued in fact to use students and assistants, some paid by the artist, some paying fees to learn.

Seongha Jeong (정성하) (colloquially: Sungha Jung) (born 2 September 1996) is a South Korean professional acoustic finger-style guitarist who has risen to fame on YouTube and other sites. As of 2012, his channel had over 17 million views, with his videos getting a total of over 454 million views, and also over 726,000 subscribers.

Seongha typically takes three days to learn and practice a new piece, and video-record it for upload onto YouTube. His genre selection is rather broad, as he learns and plays many pieces that are playable on guitar, therefore consequently spread across numerous genres.

Seongha has won 13 awards on YouTube, including 6 "#1" awards. Also on YouTube, Seongha has 523 videos with over one million views. Seongha's video with the most views is the one which shows him playing the theme from "Pirates Of The Caribbean".

In 2010, he was featured on Narsha's solo album "Narsha" for the song "I'm in Love" Seongha has composed 18 pieces as of February 2011, two of which are featured in his debut album, "Perfect Blue". He released his second album, "Irony", on 21 September 2011.