Which renowned musician is known for both playing the trumpet and singing?

Louis Armstrong is renowned for his remarkable contributions to both trumpet playing and singing, cementing his legacy as one of the most influential figures in jazz music. His unique style on the trumpet was characterized by his virtuosic technique and distinctive tone, which set a standard for trumpet players who followed.

In addition to his instrumental prowess, Armstrong was also a gifted vocalist known for his gravelly voice and charismatic stage presence. Songs like "What a Wonderful World" and "Hello, Dolly!" showcase his vocal talent, where he blends jazz rhythms with scat singing. This dual capability is a hallmark of his artistry, making him a pivotal figure not only in the world of jazz trumpet but also in American popular music as a whole.

The other musicians mentioned are also highly respected in the jazz genre but are primarily known for their unique contributions in specific fields: John Coltrane as a saxophonist, Thelonious Monk as a pianist and composer, and Duke Ellington as an orchestra leader and composer. While each of these musicians has made significant impacts in music, Armstrong's combination of trumpet playing and singing sets him apart as the quintessential answer to the question.