The label name was crafted by Rosenthal to suggest a combination of the Greek oracle, nearby Adelphi, Maryland, as well as a tip of the hat to a John Fahey song, "The Downfall of the Adelphi Rolling Grist Mill". Extensive field recordings were begun in 1964 and expanded to include film documentation beginning in early/mid 1969, including sessions in Chicago, St. Louis, Memphis and the Mississippi delta. In the 1970s the label began issuing Folk, Jazz & blues-rock albums. The latter were significantly important to the development of that genre. In the mid-1970s two of Adelphi's biggest selling artists were the Nighthawks and the Rosslyn Mountain Boys. Towards the end of the 1970s the label's sales and growth had significantly expanded particularly marked in the early 1980's when Adelphi established its wholly owned subsidiary Label "Sunsplash Records" predominantly to issue Jamaican Reggae performances from the 1982 Reggae Sunsplash Festival. Musician signings continued into the 1990s and after a short hiatus resumed in the 2000s with studio sessions in New Orleans by Adelphi Artist Ken Swartz & The Palace of Sin, and Silver Spring, MD sessions with the Rose Sheehan Group including B/U vocals by Lisa Null.
Musicians on that label are (among others) The Nighthawks, Catfish Hodge and Roy Buchanan, (rock); Lenny Breau, Reuben Brown and Richie Cole (jazz); Yellowman, Big Youth and Toots & the Maytals (reggae); Rev. Gary Davis, Gene Johnson, and Rev. Robert Wilkins (blues and spirituals); plus Nathan Beauregard, Roy Book Binder, Roy Buchanan, R. L. Burnside, Gus Cannon, David Honeyboy Edwards, Paul Geremia, Mississippi John Hurt, Backwards Sam Firk, Skip James, Furry Lewis, Bill Blue, Little Brother Montgomery, Charles Tyler and Bukka White (blues), plus Patrick Sky (folk).
- List of record labels - Sunsplash, GENES (pronounced Jenn-ess) Blues Vault Series CDs, Dental Records
- Dunlap Jr., David (July 7, 2006). "The Cosmos Club". Washington City Paper. Retrieved March 10, 2010.
- The Routledge Encyclopedia of the Blues, ed. Edward Komara (New York: Routledge), ISBN 0-415-92699-8
- "Roy Buchanan". Adelphirecords.com. Retrieved 2016-12-12.
- "Adelphi Revamps Foreign Distrib, Ponders Licensing". Billboard. December 24, 1977. p. 18.
- Callahan, Jean (September 20, 1980). "No Recession for the Adelphi Label". Billboard. p. 10.
- Komara, Edward M. (2006). Encyclopedia of the Blues. Psychology Press. p. 9. ISBN 9780415926997.
- "4101PatSky". Adelphirecords.com. Retrieved 2016-12-12.
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