Carrie Underwood performs a capella at Trump inauguration

Los Angeles Philharmonic on Instagram: "Festive a capella singing will soon fill Walt Disney Concert Hall! From the candlelit chant procession to the triumphant gospel finale, Chanticleer presents a cappella arrangements of some of the greatest and most moving Christmas music from throughout the centuries. Get your tickets today to join us on December 15!"

Singers on Instagram: "The Harvard Din & Tonics are an a cappella group from Harvard University. Known for their jazz-infused arrangements, swing style, and tuxedo performances, they combine music with humor and stagecraft. The group performs a mix of jazz, pop, and original arrangements, often touring internationally. via TT/dinandtonics"