- Sep 1 Joseph Trohman, American guitarist (Fall Out Boy - "This Ain't a Scene, It's an Arms Race"), born in Hollywood, Florida
- Sep 1 Ludwig Göransson, Swedish Emmy, Grammy, and Academy Award-winning composer and record producer (The Mandalorian; Childish Gambino; Black Panther), born in Linköping, Sweden
- Sep 2 Jack Peñate, British rockabilly singer-songwriter and musician (Matinée), born in London, England
- Sep 4 Camila Bordonaba, Argentine actress and singer-songwriter, born in El Palomar, Argentina
- Sep 10 Matthew Followill, American alternative-rock backing vocalist and musician (Kings of Leon - "Use Somebody"), born in Oklahoma City, Oklahoma
- Sep 14 Ayushmann Khurrana, Indian actor and singer (Vicky Donor), born in Chandigarh, India
- Sep 14 Melissa McGhee, American rock singer (American Idol, season 5), born in Tampa, Florida
- Sep 16 Katie Melua, Georgian-British singer (Piece by Piece), born in Kutaisi, Georgian SSR, USSR
- Sep 16 Sabrina Bryan, American actress and singer (The Cheetah Girls), born in Yorba Linda, California
- Sep 18 Dizzee Rascal [Dylan Kwabena Mills], English rapper (Boy in da Corner), born in London, England
- Sep 19 Eamon [Doyle], American pop singer ("F*ck It (I Don't Want You Back)"), born in Staten Island, New York
- Sep 21 Wale [Olubowale Akintimehin], American rapper of Nigerian heritage (The Gifted), born in Washington, D.C.
- Sep 22 Ross Jarman, English drummer (The Cribs), born in Wakefield, England
- Sep 22 Theresa Fu, Hong Kong singer and actress
- Sep 23 Louie Stephens, American rock keyboard player and singer (Rooney)
- Sep 24 Taylor Eigsti, American Grammy Award-winning jazz pianist, composer ("Lucky To Be Me"), orchestrator, and educator, born in Menlo Park, California
- Sep 26 Keisha Buchanan, British pop and R&B singer (Sugababes - "Round Round"; "Push the Button"), born in Kingsbury, England
Avril Lavigne (39 years old)
Sep 27 Canadian singer-songwriter (Complicated, Sk8er Boi), born in Belleville, Ontario
- Sep 27 Cyrille Dubois, French operatic tenor and lieder singer, born in Ouistreham, France
- Sep 28 Melody Thornton, American singer and dancer (The Pussycat Dolls), born in Phoenix, Arizona
T-Pain (39 years old)
Sep 30 American rapper (Epiphany), born in Tallahassee, Florida
About September 1984
How Old? 39 years old
Generation: Millennial
Leap Year: Yes
Country Singers
Jazz Musicians
Opera Singers
Pop Stars
Rappers
Rockers