"Happy Birthday Sweet Sixteen" is a pop song released in 1961 by Neil Sedaka. Sedaka wrote the music and performed the song, while the lyrics were written by Howard Greenfield. The song is noted for being similar in musical structure to Take Good Care of My Baby by Bobby Vee (another 1961 hit), and additionally for its resemblance to the melody of the Chiffons' subsequent 1963 hit "One Fine Day". Both of these songs exhibiting similarity to "Happy Birthday Sweet Sixteen" were penned by the team of Carole King and Gerry Goffin (King and Sedaka were close friends in high school, and Sedaka was known for his appropriation of other popular song motifs in his work). The song reached #6 on the Billboard Hot 100 chart and No. 3 on the UK Singles Chart.