der Gitarrist
guitarist
A person who plays guitar, whether professionally or as a hobby.
Der Gitarrist der Band spielte ein beeindruckendes Solo.
The band's guitarist played an impressive solo.

guitarist
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guitarist
A person who plays guitar, whether professionally or as a hobby.
Der Gitarrist der Band spielte ein beeindruckendes Solo.
The band's guitarist played an impressive solo.

The word ends in '-ist'. This ending is often used for people who perform a particular activity, especially in artistic or scientific fields, for example 'Pianist' (pianist), 'Journalist' (journalist).
Er ist nicht nur Sänger, sondern auch ein talentierter Gitarrist.
He is not only a singer, but also a talented guitarist.
Common combinations are 'der Gitarrist einer Band' (the guitarist of a band), 'ein Solo spielen' (to play a solo), or terms like 'Lead-Gitarrist' (lead guitarist) or 'Rhythmus-Gitarrist' (rhythm guitarist).
Der Lead-Gitarrist ist für die Melodien und Soli verantwortlich.
The lead guitarist is responsible for the melodies and solos.
To express belonging or association, the genitive is often used. The phrasing is then, for example, 'der Gitarrist der Band' (the band's guitarist).
Der Gitarrist der Rolling Stones ist weltberühmt.
The guitarist of the Rolling Stones is world-famous.
musician
'der Musiker' and 'der Gitarrist' both refer to people who make music. 'der Musiker' is more general: the person can sing, play piano, compose, or play another instrument. 'der Gitarrist' is more specific and means a person who plays guitar. The words can be confused because a guitarist can always also be a musician. But not every musician is a guitarist. If the instrument is important, you say 'Gitarrist'. If the instrument does not matter or is unknown, 'Musiker' fits better.

Der Gitarrist übt jeden Abend neue Lieder für die Band.
The guitarist practices new songs for the band every evening.
Nach dem Konzert spricht ein Musiker mit den Gästen.
After the concert, a musician talks with the guests.