Violin virtuoso Jaroslav Kocián with his students Jiří and Ljuba Straka rehearsing Petr Ilyich Tchaikovsky´s Concerto for Violin and Orchestra in D Major, Op. 35. Maestro Kocián borrows a book at the Municipal Library in Prague in a segment from Československý zvukový týdeník Aktualita (Czechoslovak Aktualita Sound Newsreel) 1942, issue no. 49B.