The Danish Music Museum in Copenhagen is one of the oldest museums of musical history in the world, having been founded in 1898. It features detailed exhibitions on the chronological development of musical instruments from the Bronze Age to the 21st century.

Wind instruments
Although I can’t recall seeing any instruments from the Bronze Age (which was four to five thousand years ago), I do remember numerous instruments from later centuries, particularly the 17th, 18th and 19th.

Pianos
The museum has a great variety of pianos and other keyboard instruments, such as harpsichords, clavichords and pianofortes.

Player piano with a piano roll
From the early 20th century, they even have some player pianos with piano rolls. The piano roll was a roll of strong paper with holes to record the notes. (Holes punched in paper rolls or in cards were a commonly used form of data storage for all sorts of purposes until well into the 1970s.)
These player pianos were completely mechanical, and were often used in houses that had no electricity. Energy was provided by someone pumping the foot-pedals, enabling the piano to play itself.
(See also: Look ma, no electrons!)

How violins are made
There were also thematic exhibitions, for instance this one on how violins are made. And there were numerous examples of violins and other stringed instruments from the past several centuries.

Exhibit on the history of musical notation
Another exhibit was arranged to show how musical notation has changed through the centuries.

The old building of the Danish Music Museum
When I was there (I went on my bike on a very rainy day), the Danish Music Museum was still in its old building at Åbenrå 30.
A few years later, in 2014, the museum moved into larger quarters in the former Radio House at Rosenørns Allé 22 in Frederiksberg. There they have more space for their many exhibits, and for their library and educational activities. Also, they have started a new initiative called “The Sound Room”, where “children of all ages can have a try at playing everything from the harp and the kettledrum to the electrical guitar and the xylophone.”
My photos in this post are from 2009. I revised the text in 2020.
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It takes a lot of practice. I played in Ars Antiqua in Rochester, NY many many years ago. Ed picked it up when he was teaching at UNC and once performed the Brahm’s horn trio on hand horn. I had a hand horn made for him in the right key. Now I’m wondering where the horn is. Haven’t seen it in years.
How fun. We would have loved it. Loved the horns in your second picture. We can actually play the ones without valves. Also can read early manuscripts since we had to learn Gregorian Chant at school. My paternal grandparents did have electricity but they also had a player piano with foot pedals. The kid in the next farm used to come down and we’d take turns at the pedals and sing through all the piano rolls. We also had classical music for piano on rolls. Wonder what happened to all of them? It was great fun.
I know some of the horn players at the Frankfurt Opera, and not all of them feel confident about playing the ones without valves.
This must have been a lovely and interesting place to visit!