CREATE TABLE table_23591 ("Title" TEXT, "Author" TEXT, "Reader" TEXT, "Format" TEXT, "Company" TEXT, "Release Date" TEXT, "Notes" TEXT)

who is the reader on the download/cd format of the title written by author lidster, joseph joseph lidster?
SELECT "Reader" FROM table_23591 WHERE "Format" = 'Download/CD' AND "Author" = 'Lidster, Joseph Joseph Lidster'
SELECT "Reader" FROM "table_23591" WHERE "Author" = 'Lidster, Joseph Joseph Lidster' AND "Format" = 'Download/CD'