BBC iplayer (yes, TV!)

Peter, Paul and Mary: Rhythm on Two Part Two Available until Monday 1:30am
https://www.bbc.co.uk/iplayer/episode/m00233z5/peter-paul-and-mary-rhythm-on-two-part-two
Second part of a concert given by well-known American folk trio Peter, Paul and Mary during a visit to the UK in 1983. Recorded on location at the Southport Theatre. First shown 9:45pm 26 Nov 1983

Joni Mitchell in Concert Available for 23 days
https://www.bbc.co.uk/iplayer/episode/m0023sy2/joni-mitchell-in-concert?at_mid=GT5khuymAE&at_campaign=Joni_Mitchell_in_Concert&at_medium=display_ad&at_campaign_type=owned&at_audience_id=SS&at_product=iplayer&at_brand=m0023sy2&at_ptr_name=bbc&at_ptr_type=media&at_format=image&at_objective=consumption&at_link_title=Joni_Mitchell_in_Concert&at_bbc_team=BBC
A performance from 1970 by celebrated singer-songwriter Joni Mitchell, which includes her songs Both Sides Now, California, Big Yellow Taxi and Chelsea Morning. First shown 10:15pm 9 Oct 1970