This Sunday night on “The Lost Chord,” we’ve a present for Sir Edward Elgar, on his birthday.

Elgar was one of the first of the great composers to endeavor to set down “definitive” interpretations of his own works on recordings. Or so it has been thought. But did Elgar really regard these performances as definitive? In fact, Elgar took great care to “grade” the various takes from his recording sessions. Some of these, he instructed, were to be destroyed outright; others were held, as the composer took the time to consider.

What emerges, upon listening to a 4-CD set, “Elgar Remastered,” on the SOMM Recordings label, are the impressions that (1) Elgar was fairly meticulous when it came to preserving his legacy, and (2) he also understood that there’s more than one way to skin a cat. Rediscovered alternative takes make clear that the composer was amenable to looking at his own works from a variety of perspectives.

For their parts, the conscientious engineers at EMI employed multiple machines to guard against technological failure. This was back in the late 1920s and early ‘30s. Now, for the first time, the elements have been brought together and skillfully combined to create a kind of “accidental” stereo.

Engineer Lani Spahr has worked wonders with these recordings, from the private collection of Arthur Reynolds, chairman of the North American Branch of the Elgar Society. He also goes into considerable detail in his liner notes – in fact, to a degree that would be impractical to relate here.

A good deal of the set is devoted to recordings and alternative takes of Elgar’s Cello Concerto. As on the composer’s authorized recording, issued on EMI, Beatrice Harrison is the soloist. These include the first complete electrical recording, from 1928 – the one which would ultimately be published, in mono – with previously unissued, alternative takes from the same sessions. There is also an earlier, truncated recording from 1920, set down using the acoustic process, and a performance of the concerto’s Adagio movement alone, with Harrison accompanied at the keyboard by Princess Victoria.

The gem of the set is Harrison’s celebrated 1928 recording, heard here for the first time entirely in stereo, or what passes for stereo.

Harrison was Elgar’s preferred soloist. He lavished praise on her performances, even as she took liberties with the score. At the session for this particular recording, he was overheard to say, “Give it ‘em, Beatrice, give it ‘em. Don’t mind about the notes or anything. Give ‘em the spirit.”

Worlds away from the effusive, heart-on-the-sleeve approach of Jacqueline du Pré, Harrison’s interpretation is nonetheless riveting on its own terms. As with the other recordings in the collection, it is a kind of time capsule of period performance practice – with swooping portamenti (audible slides between notes) – and the musicians’ flexibility in regard to both tempo and phrasing.

And Elgar can be such a volatile conductor! In addition, we’ll hear a cracking rendition of the “Cockaigne Overture” and a performance of the prelude to the oratorio “The Kingdom,” which really takes flight.

Hear Elgar as you’ve never heard him before – in “accidental” stereo – on “Pomp and Happenstance,” this Sunday night at 10:00 EDT, on WWFM – The Classical Network and wwfm.org.