In common usage, a collection is any group of items that has one or more properties in common. For example, paintings from the same artist, or coins from Germany before 1900, see collecting and collectible.
... February 29 - Jimmy Dorsey, bandleader (+ 1957)
March 1 - Glenn Miller, bandleader (+ 1944)
March 2 - Dr. Seuss, author (+ 1991)
March 8 - Victor de Kowa[?], actor (+ ...