SELECT "Original air date" FROM table_73578 WHERE "Title" = 'Do You Believe in Magic'
When did the episode titled 'Do you believe in magic' run for the first time?
CREATE TABLE table_73578 (
    "No. in Series" real,
    "No. in Season" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "U.S. viewers (millions)" text
)