In 2018, Christopher Plummer spoke with The Guardian about his new film, and predictably, the conversation turned to The Sound of Music. He said that by that point, he'd found "peace with it," and noted that the only reason he agreed to take the job in the first place was because he'd been working on his singing voice, and wanted the opportunity to sing in a film. It didn't happen, though, not really — because that's not him singing.
When NPR interviewed him in 2012 and asked him if he occasionally broke into song and warbled a few lines of "Edelweiss," he responded with: "Of course not." He went on to explain that the "entrances and exits" from the songs were him, but the majority of it was not. The reason was fairly simple: Julie Andrews was such a phenomenal singer, he said she "was awfully hard to match."
Everyone can agree that there's no shame in that, so they dubbed most of his singing. Most movie fans will have heard Plummer's vocal stand-in, Bill Lee, before, singing in The Jungle Book (as Shere Khan), Peter Pan, and Lady and the Tramp (among many, many other films).
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