CREATE TABLE table_73365 ("Piano" TEXT, "Conductor" TEXT, "Orchestra" TEXT, "Record Company" TEXT, "Year of Recording" FLOAT, "Format" TEXT)

Which orchestra has a recording year of 1951?
SELECT "Orchestra" FROM table_73365 WHERE "Year of Recording" = '1951'
SELECT "Orchestra" FROM "table_73365" WHERE "Year of Recording" = '1951'