"We've been preparing for this our whole lives."
Aside from those powerhouse vocals, the rapturous sound heard during the performance can be attributed to Too Many Zooz, the performance's electrifying and vivacious backing band. The self-described "brass house" trio -- who recently released the full-length album Subway Gawdz and have plans to tour this spring -- are still reeling from the night, which they say was amazing, incredible and inspiring.
"I was really nervous 10 or 15 minutes before," Leo (who plays saxophone) tells Billboard over the phone while waiting to catch a flight. "But once it started, it felt perfectly natural and great and meant to be."