Let's make this birthday one to remember.

64 years old (Born on May 09, 1961)

Happy Birthday, Sean Altman! From chasing Carmen Sandiego around the globe with Rockapella to pioneering modern a cappella—your voice has been stealing hearts longer than Carmen's stolen landmarks. Your harmonies are smoother than her escapes and your melodies catchier than any criminal mastermind’s schemes.

Whether you're rocking stages or inspiring new generations of vocalists, you remain timelessly cool (and suspiciously youthful). May this birthday bring as much joy as you've given fans worldwide—and may it be easier finding cake today than tracking down that elusive red-coated villainess!

Here's hoping another year brings more harmony-filled adventures. Doo-wop do celebrate big!