Question: which American hard rock band has songs that have been covered by Racer X, Fu Manchu, The Smashing Pumpkins, Sebastian Bach and Fighting Gravity? 
Sentence (from "The Last Hard Men (band)"): The Last Hard Men were an alternative music supergroup composed of former Skid Row vocalist Sebastian Bach, The Frogs guitarist Jimmy Flemion, The Breeders guitarist–vocalist Kelley Deal, and The Smashing Pumpkins drummer Jimmy Chamberlin.
Relevant evidence: No