CREATE TABLE table_59884 ("Pianist" TEXT, "Conductor" TEXT, "Record Company" TEXT, "Year of Recording" FLOAT, "Format" TEXT)

What is the year that a record was recorded with Libor Pesek as conductor?
SELECT SUM("Year of Recording") FROM table_59884 WHERE "Conductor" = 'libor pesek'
SELECT SUM("Year of Recording") FROM "table_59884" WHERE "Conductor" = 'libor pesek'