

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. Mickey's next birthday cartoon, Mickey's Birthday Party, was released on February 7, 1942. Mickey's "official" birthday changed often - Walt Disney declared in 1933 that Mickey's birthday was October 1, and in the Mickey Mouse comic strip, Mickey celebrated his 7th birthday on September 28, 1935. Mickey Mouse was a little over two years old at this point, having debuted in Steamboat Willie in November 1928. The xylophone gets excited and Mickey ends up riding it like a bucking bronco, ending up with a fishbowl over his head. Heading to the xylophone, Mickey plays " Home! Sweet Home!" and then accompanies Minnie on " Twelfth Street Rag". Horace Horsecollar and Clarabelle Cow also have a spirited dance break. After a while, the piano stools take over, and Mickey and Minnie dance as well. Then they play " Darktown Strutters' Ball" as the guests dance. 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". A pig chef offers him a birthday cake, but Mickey blows so hard that all of the cake ends up on the pig's face. Minnie Mouse throws a surprise birthday party for Mickey, and he is surrounded by a circle of friends singing and dancing his praises. It was the twenty-fifth Mickey Mouse short to be produced, the first of that year. The Birthday Party is a Mickey Mouse short animated film first released on January 2, 1931, as part of the Mickey Mouse film series.
