Andantino in D major (lost piano work found in 2013)
No one knew about this work until 2013 it was found from the library of Harvard University. Researcher Pekka Helasvuo was searching for the manuscript for some impromptu and asked Harvard to check if they would have it in their collection. Surprisingly this piano work was found and also 2 original (already well known) manuscripts by Sibelius.
Jean Sibelius (– 1889-08-19)