der Musiker
musician
A person who makes music by playing an instrument, singing, composing, or conducting, often as a profession.
Der Musiker spielte ein beeindruckendes Solo auf seiner Geige.
The musician played an impressive solo on his violin.

musician
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musician
A person who makes music by playing an instrument, singing, composing, or conducting, often as a profession.
Der Musiker spielte ein beeindruckendes Solo auf seiner Geige.
The musician played an impressive solo on his violin.

'Der Musiker' is derived directly from 'die Musik' (music). The ending '-er' is often used in German to refer to a male person who performs a certain activity.
Wer Musik macht, ist ein Musiker.
Someone who makes music is a musician.
A musician can do different activities. Typical expressions are: 'ein Instrument spielen' (to play an instrument), 'in einer Band spielen' (to play in a band), 'Konzerte geben' (to give concerts), or 'Lieder komponieren' (to compose songs).
Mein Bruder ist Musiker und spielt in einer Rockband.
My brother is a musician and plays in a rock band.
'Musiker' is a general term. You can make it more precise with compounds to describe the type of music or the circumstances, e.g. 'Straßenmusiker' (street musician), 'Berufsmusiker' (professional musician), or 'Jazzmusiker' (jazz musician).
Vor dem Dom spielte ein talentierter Straßenmusiker.
A talented street musician was playing in front of the cathedral.
artist
'der Künstler' and 'der Musiker' can both refer to people who work creatively. But 'der Künstler' is broader: the person may paint, write, make music, or create other kinds of art. 'der Musiker' is more specific and means a person who makes music, for example by singing or playing an instrument. The words can be confused because many musicians are also artists. But when it is specifically about music, 'Musiker' is more natural and more precise.

Am Wochenende spielt der Musiker mit seiner Band auf einem Stadtfest.
At the weekend, the musician is playing with his band at a town festival.
Der Künstler zeigt seine neuen Bilder in einer kleinen Galerie.
The artist is showing his new paintings in a small gallery.