Jon Batiste, the renowned jazz pianist, leader of the group Stay Human, and bandleader for The Late Show with Stephen Colbert, recently performed at the Louis Armstrong Center for Music and Medicine’s holiday concert. In the Mount Sinai Downtown-Union Square atrium, Mr. Batiste took to the grand piano, serenading an audience of patients and staff with holiday favorites. Mr. Batiste also played the melodica in accompanying Singing Together Measure by Measure, a choir of recovering stroke patients and caregivers. Actively involved with the Center, Mr. Batiste received the What a Wonderful World Award in 2014 and serves on the Center’s Steering Committee.