I suspect it was an intentional choice so that artist names like Jay-Z remain properly separated in the URL, especially in cases of multiple-artist billings (ex

I suspect it was an intentional choice so that artist names like Jay-Z remain properly separated in the URL, especially in cases of multiple-artist billings (ex. https://www.last.fm/music/Nas+&+Jay-Z https://www.last.fm/music/Nas+&+Jay-Z)