user: ### NOW ANSWER:
Question: What is the year that a record was recorded with Libor Pesek as conductor?
Columns: ['Pianist', 'Conductor', 'Record Company', 'Year of Recording', 'Format']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['Heinrich Neuhaus', 'Nikolai Golovanov', 'Russian Disc', 1946.0, 'CD']
SQL:

assistant: SELECT SUM("Year of Recording") FROM "Table" WHERE "Conductor" = 'Libor Pesek';