Not upset but I am touchy about gpt results. The ending wasn't the key part, the <cat> was the key part. I added img because that's the only image type I can think of that makes sense to write to sda in that way.
Why would anyone write an mp3 to a block device bit by bit
Did this look like a proper bash command to you?! Maybe that was some runable python code?!
File ending has nothing to do with its contents. Image.img could be an mp3.
Stop hairsplitting.