Listen to Happy Birthday, Mr. Smithers (From "Go Simpsonic with The Simpsons"/Soundtrack Version) online. Happy Birthday, Mr. Smithers (From "Go Simpsonic with The Simpsons"/Soundtrack Version) is an English language song and is sung by The Simpsons. Happy Birthday, Mr. Smithers (From "Go Simpsonic with The Simpsons"/Soundtrack Version), from the album Go Simpsonic with The Simpsons (More Original Music from the Television Series), was released in the year 2021. The duration of the song is 0:16. Download English songs online from JioSaavn.