"One More Saturday Night" for your Saturday night.
If this vintage clip filmed in Copenhagen in 1972 reawakens your inner Dead Head, then you can always wade your way into the Internet Archive's Grateful Dead collection, which hosts dozens of Dead shows from the 1970s through the 1990s. Some concerts (usually recorded by members of the audience) can be downloaded. Other audio (usually taken from the soundboard) can be streamed. All together, you will find hundreds of hours of free concert recordings.