Started in 2008, these recorded 'mini-concerts' are hosted by Bob Boilan of the NPR program, All Songs Considered.
Wikipedia has an extensive concert list of performers and dates.
Library of Congress Performing Arts Database
Chicken by Will Accooe (New York : Howley, Haviland and Co., c1899.). African-American Sheet Music, 1850-1920, American Memory, Library of Congress.
The Performing Arts Databases page contains database and catalog resources that are intended to help users with research in the performing arts areas. The databases are stand-alone resources that are not integrated with the rest of the Library’s digital collections or catalogs. In many cases, the databases do not reflect actual holdings of the Library of Congress and are provided only as reference resources.
The Library of Congress added new entries on March 24, 2021!
Read about it here
In light of the ongoing situation with COVID-19, some organizations are offering free access to streaming or archived performances.
Folkstreams Folkstreams is a non-profit dedicated to finding, preserving, contextualizing, and showcasing documentary films on American traditional cultures.
The Chamber Music Society of Lincoln Center Watch archived and livestream performances.
The Library of Congress Watch archived performances. Check out a performance by Hubby Jenkins performance on LC's YouTube channel.
OntheBoards.tv is a resource for educators working in dance, art, and performance. (Subscription fee)
Wigmore Hall Watch archived and livestream performances. (Requires creating an account).