Blom was born in Bern, Switzerland. His father was of Danish and British descent, and his mother was Swiss. He was educated in German-speaking Switzerland, and later in England. He was largely self-taught in music. He started in music journalism by assisting Rosa Newmarch in writing program notes for Sir Henry J. Wood's Prom Concerts, which were notable for their abundance of accurate information. From 1923 to 1931 he was the London music correspondent for the Manchester Guardian. He then went to the Birmingham Post, and returned to London in 1949, as music critic for The Observer. He retired as chief music critic for The Observer in 1953, but still wrote weekly contributions right up till his death. He was the editor of Music & Letters from 1937 to 1950, and again from 1954 until his death. He withdrew in 1950 because of his preoccupation with the preparation of Grove's Dictionary. He returned in 1954 only because the proprietor and then-editor, Richard Capell, died. In his capacity as musical adviser to the Dent publishing firm, he also edited the Master Musicians series, of which he wrote "Mozart". He discovered a number of young authors and gave them their first opportunities to write music biography. Eric Blom's first lexicographical work was Everyman's Dictionary of Music, which went through several editions. He succeeded H. C. Colles as editor of Grove's Dictionary for the 5th edition. Colles had confined the dictionary to five and six volumes for Grove III and IV respectively. Blom expanded it to nine volumes for Grove V. As well his overall editing responsibilities, Blom personally wrote hundreds of entries, including Arthur Sullivan. He also translated many entries by foreign contributors. A Supplementary Volume was published in 1961, after Blom's death, but he had done most of the work on it. His introduction and acknowledgments were included, and he is credited as Editor, with Denis Stevens as Associate Editor. His own biography, written by Frank Howes, appeared in the Supplementary Volume. Grove V was reprinted in 1966, 1968, 1970, 1973 and 1975, and remained the standard edition of Grove until the New Grove was released in 1980. Blom was forthright in his opinions. He could be almost gushing about his favourites, particularly Mozart, and most especially his operas. He wrote that Benjamin Britten's Peter Grimes was "so impressive and original that only the most absurd prejudice will keep it out of the great foreign opera houses". Equally, he did not shrink from criticising composers he thought less of, and introduced some of his own prejudices. He was capable of uniquely insightful comments on well-known works in which he held a minority opinion; e.g., that the solo part of the Sibelius Violin Concerto "is closely interwoven with the symphonic tissue, and is therefore neglected by the average virtuoso". Even more notoriously, he wrote that Rachmaninoff "did not have the individuality of Taneyev or Medtner. Technically he was highly gifted, but also severely limited. His music is... monotonous in texture... The enormous popular success some few of Rakhmaninov's works had in his lifetime is not likely to last, and musicians never regarded it with much favour". To this, Harold C. Schonberg, New York critic not immune to snobbery of his own, in his Lives of the Great Composers, responded with equally outspoken unfairness, "It is one of the most outrageously snobbish and even stupid statements ever to be found in a work that is supposed to be an objective reference". Blom translated many documents for Otto Erich Deutsch's Mozart: A Documentary Biography. He assisted Gervase Hughes in the writing of his book . In 1956, for the Mozart bicentenary, he published some of Mozart's letters translated by Emily Anderson. He died on 11 April 1959, and is interred at Golders Green Crematorium. He had requested that at his funeral, the organist play J.S. Bach's final chorale prelude Vor Deinen Thron tret' ich zu Dir. Unfortunately, 'Bach chorale' was misunderstood, and the laughably incongruous "Barcarolle" from Offenbach's The Tales of Hoffmann was played instead.
