The crossword solution for the term 'JAZZ's Blake' is EUBIE, which is a reference to the American pianist and composer Eubie Blake. Blake was an important figure in the development of ragtime and JAZZ music in the early 20th century. He was known for his compositions such as 'Charleston Rag' and 'Love Will Find a Way'. He also wrote the musical Shuffle Along, which was one of the first Broadway musicals written by African Americans.