Best Opening Band?

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Black Sabbath for Alice Cooper, early '70 @ The Whisky. The Sabs came out in full white tux' w/top hats and immediately launched into Paranoid.

Captain Beyond for Alice/JoJoGunne, and again a month later for Sabbath/Gentle Giant, both @ The Hollywood Bowl, '72.
CB could hang with anybody.

Yes w/Bruford for Sabbath, The Forum, '71.

Foghat for Humble Pie, Long Beach Arena, '73.

Golden Earring for Robin Trower @ Santa Monica Civic, '72.

Emmylou Harris w/James Burton for Golden Earring, The Shrine, '74.

Lynyrd Skynyrd for Sabbath, San Berdoo, '74.

Carl Perkins for... The Judds..., late 80s, Waikiki Hilton. Total class kicker legend.

The Tubes for Led Zep, Kezar Stm./Frisco, '73. Way before they broke, and almost stole the show.

Stevie Ray Vaughn for The Police, Aloha Stm., '84., then again for ZZ Top in '87.
Fabulous Thunderbirds for SRV, NBCenter/Honolulu, late 80s.