Today in 1977 Who drummer Keith Moon joined Zeppelin on stage at the L.A. Forum. Moon played throughout the nearly 20-minute drum solo “Moby Dick” and returned later for two encores (“Whole Lotta Love”, “Rock and Roll”). The footage can be heard on the bootleg recording for this concert titled For Badgeholders Only.
YouTube link to the audio: http://www.youtube.com/watch?v=NWItY7eSyr8
Also today, in 2016, a jury found Led Zeppelin not guilty of copying the “Stairway to Heaven” intro from the Spirit song “Taurus”.
More info: http://money.cnn.com/2016/06/23/media/stairway-to-heaven-trial-verdict