[3] Minnie Mouse throws a surprise birthday party for Mickey, and he is surrounded by a circle of friends singing and dancing his praises.

Mickey opens his present—a small piano, to match Minnie's -- and the two mice play and sing "I Can't Give You Anything but Love, Baby".

It was not until the early 1970s that Dave Smith of the Walt Disney Animation Studios Archives determined that the date of Steamboat Willie's premiere was November 18, and fixed that as Mickey's official birthday.

"[3] The Film Daily (February 1, 1931): "A Mickey Mouse cartoon in which the animals stage a birthday party, featuring an enormous cake.

"[7] The short was released on December 2, 2002 on Walt Disney Treasures: Mickey Mouse in Black and White.