I don't have any idea at all where I got the mp3 of this song, or rather track--it's not exactly a song, but a combination of droning and mechanical sounds and percussion. I found it haunting. And I don't remember how I figured out that the voice might or must be that of Robert Oppenheimer, as it does not include the famous "I am become death" line, but somehow I did.

We knew the world would not be the same. A few people laughed. A few people cried. Most people were silent. 

I haven't seen Oppenheimer, but it strikes me that this would be an effective soundtrack for the credits, if not for Oppenheimer then another on a similar subject. 

After not hearing this for some years, I thought of it a few months ago and went looking for it among my mp3s. It took me a long time to find it, which is not surprising: I have thousands of mp3s, and the name of the artist is Scar Tissue; the name of the track is "Lazsik"; the name of the album is Form/Alkaline. 

Here is Oppenheimer himself.