Before things got quite so bad as they are now, bands used to put DVDs out.
Mostly these would feature a recording of a live performance. But sometimes they were collections of music videos, or even specially-made “behind the music” documentaries. The best music DVDs contained a combination of the above.
Each DVD is a time capsule of an era that was very similar to our own, but also profoundly different. This is the era just before the mass adoption of smartphones, and before social media made everyone and everything significantly worse.