He was John Coltrane's mentor from 1946 until the early 1950s, introducing him to music theory beyond chords and scales and exposing him to the music of other cultures. Sandole taught advanced harmonic techniques that were applicable to any instrument, using exotic scales and creating his own. He taught privately until the end of his life. His students included saxophonists James Moody, Michael Brecker, Rob Brown, and Bobby Zankel; pianists Matthew Shipp and Sumi Tonooka; guitarists Jim Hall, Joe Diorio, Pat Martino, Joe Federico, Tony DeCaprio, Jon Herington, Larry Hoffman, and Harry Leahey and other musicians such as Rufus Harley, Bob deVos and Frank Gerrard.
- Naturalization Records: Joseph Sandoli (Dennis' father), 15 September 1909, United States District Court for the Eastern District of Pennsylvania, National Archives and Records Administration
- Oct. 4, 2000 Obituary in Philadelphia Inquirer
- Obituary in New York Times
- Ben Ratliff, Dennis Sandole, Jazz Guitarist And an Influential Teacher, 87, The New York Times, October 8, 2000
- "Dennis Sandole: Coltrane's Mentor Was Legendary Jazz Teacher". The Scotsman. Retrieved 2007-10-15.
- Brothers Sandole – Modern Music from Philadelphia, Fantasy Records, 1955 OCLC 29617817
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