Sort of relevant link - Live Music archive. In case you haven't come across it before, this is part of the Internet Archive which has been archiving web sites etc since 1996. Currently contains about 1 petabyte of information and is an online digital library with very large collections of audio, video, texts, web sites, and software. For example, it claims to host footage of more than 20,000 live concerts, and snapshots of the Internet dating back to 1996, accessible through the well-known Wayback Machine, which currently hosts over 40 billion web pages.
If you are a Grateful Dead fan there is a VAST quantity of Live Concerts available. There is a fair selection of artists there.