Sonatas for trumpet and piano have played an impactful role in the development of the trumpet as a recital instrument. Thorvald Hansen’s 1903 sonata for cornet and piano was the earliest sonata for our instrument, later leading to the first two sonatas for the Bb trumpet and piano in 1939 by German composer Paul Hindemith and Soviet composer Boris Asafiev. The first American sonata for trumpet and piano was written by Harold Shapero in 1940 and was dedicated to his teacher, Aaron Copland. These early sonatas led to other prominent 20th Century trumpet sonatas that were written by American composers Kent Kennan, Halsey Stevens, and Eric Ewazen. As a modern solo instrument, performance and pedagogical practices for the trumpet are strongly based on compositions of the 20th Century or earlier. As we are now almost 25 years into the 21st Century, trumpet sonatas and their composers have continued to evolve and create a lasting impact on the use of the trumpet and its pedagogy. This dissertation will discuss the pedagogical impacts and musical developments of several 21st Century sonatas for trumpet and piano. Accompanying this dissertation are four recordings of some of the most recently published trumpet sonatas from 2015-2023, each by American composers of diverse backgrounds. The four recorded sonatas previously had very few or no professional recordings and exemplify modern developments on traits originally established by composers of early trumpet sonatas. Through this dissertation and accompanying recordings, I hope to encourage the use of modern trumpet sonatas for application in pedagogical instruction, performances, and college and university juries and entrance auditions.