CREATE TABLE table_name_15 (notes VARCHAR, channel VARCHAR, time VARCHAR)

What is the notes of the transmission on channel bbc four and a time of 22:30?
SELECT notes FROM table_name_15 WHERE channel = "bbc four" AND time = "22:30"
SELECT "notes" FROM "table_name_15" WHERE "22:30" = "time" AND "bbc four" = "channel"