Early in my cl stereo collecting days I ran into a gentleman who had the world's largest collection of recorded March music. Cylinders to 78s to LPs, he said about 250,000 pieces along with a nice collection of other recordings. He donated the March music and used the tax write down to cover the sale of the other part of his collection.
I think I recall he donated to the University of North Texas which has an extensive collection but I did not see it itemized in their list of donated collections.
He had records all over the house, but I was only in 2 rooms and a filled garage.
One room has a pair of early 20th century pianos, same well known manufacturer of nice pianos, a few years apart, one a baby grand the other an upright. I asked if they had the same family sound and we talked about that for a bit before I grabbed whatever it was I went to pick up. Interesting conversation with him.