Here's a few of those tributes.
David Lee Roth spoke about Black Sabbath taking Van Halen on its first U.K.tour and dedicated "Atomic Punk" in Paso Robles, California.
The Who dedicated "I Can't Explain" to open their show in Milan, Italy.
Dave Matthews did a solo version of "Changes" in Gilford, New Hampshire.
Def Leppard did "Changes" in Saratoga Springs, New York.
Halestorm did "Perry Mason" in Ridgefield, Washington.
Mammoth did "Mama I'm Coming Home" in Hartford, Connecticut.
Pantera, which features Ozzy's longtime guitarist Zakk Wylde, dedicated their version of "Planet Caravan" in Cincinnati.