u/Accurate_Reward_2746

So my spouse is related to someone famous in the rock ‘n’ roll industry’s spouse. She let us clean out her garage and told us we can keep anything we found in there. I found this old reel it says “John Lennon one to one Madison square garden aug 1972” does anyone know what something like this would be worth? I’ve reached out to auction sites, but no one is really giving me any answers. I don’t have anything to play it on, but I took it somewhere and they said that there is audio and video on it. I know it’s been in this garage since the 70s, so I’m not sure it’s ever been released or seen by the public. Any Beatles fans or music fanatics or even if anyone knows about these types of tapes, any advise or insight would be appreciated. Thanks!