More generally, a person who learns keyboard fingerings on the basis of relative pitch with respect to the tonic of any given composition can use a transposing piano to play along with a choir and/or orchestra performing in any key.
In 1972 he donated one piano (built in 1940 by Weser Bros. Company in New York City, NY)[1] to the Smithsonian Institution.
It is now on display in the National Museum of American Jewish History.
[2] Berlin never learned to read music, playing his songs entirely by ear in the key of F-sharp (keeping all five notes of the pentatonic scale on the “black keys”), employing his “trick piano” to do the work as necessary.
The harmonium sometimes features a mechanically shifted keyboard for transposition.