Gruber, Heinz Karl - Biography noting studies and teachers, instrumental background, and major works from the Grove Concise Dictionary of Music entry at WQXR radio.
HK Gruber in Focus - Introduction to his music by Paul Driver for Boosey & Hawkes. Emphasis given to his dark sense of humor and often unpredictable style.
HK (Heinz Karl) Gruber - Biography by Rudolph Illavsky at the Classical Composers Database notes Gruber's talents in other musical areas, his sense of humor, and membership in die reihe and the Radio Symphony Orchestra of Vienna.
A Pig Is a Pig Is a Pandemonium: HK Gruber - Review of the music theatre comedy Gloria: A Pigtale by Paul Hertlendy blends the composer's sense of humor with that of the reviewer.
