Some albums are published (also on streaming) with a commentary track, or a podcast series and making-of video series alongside it by the musician. Or n=1, I kn

Some albums are published (also on streaming) with a commentary track, or a podcast series and making-of video series alongside it by the musician. Or n=1, I know Devin Townsend has taken to doing it. Ultimately they're all promotion for their albums and concerts, of course, but they're great for their "personal branding" as well.