Artie Shaw's Interlude in B-flat is unknown to many in the classical clarinet world and remains unperformed by clarinetists, despite its historical importance as one of the earliest Third Stream compositions, the earliest composition of its type in the clarinet repertoire. This prompts the question, why? This document explores four possible reasons for the marginalization of Interlude in B-flat. First, Shaw's historical narrative typically places him within the jazz world and not the classical world. Classical clarinetists may assume a Shaw composition will require a jazz background and experience beyond their abilities, namely improvisation. Second, the instrumentation, string quartet plus jazz combo, is atypical, making it difficult to program. Third, jazz and classical educational worlds do not necessarily overlap or interact, and neither has taken ownership of this Third Stream composition. Lastly, manuscripts, recordings, and other materials for Interlude in B-flat are limited and not readily available. Because Artie Shaw is not only a significant American clarinetist but also an important composer within the Third Stream narrative, Interlude in B-flat should be known and performed. This project aimed to promote the understanding and accessibility of this important and unknown composition to the classical clarinet world by providing an accessible arrangement of the work for clarinet and piano.