CREATE TABLE table_21138 ("Cat. #" TEXT, "Artist" TEXT, "Title" TEXT, "Release date" TEXT, "Format" TEXT, "Other information" TEXT)

When was 'Tell You When' released?
SELECT "Release date" FROM table_21138 WHERE "Title" = 'Tell You When'
SELECT "Release date" FROM "table_21138" WHERE "Title" = 'Tell You When'