As the band transitions into its “legacy act” status, Smashing Pumpkins is becoming a good example of how to age gracefully, if its show at Rocket Mortgage FieldHouse Saturday night is any evidence. The Chicago alt-rock band’s 18-song, 110-minute set was a mix of new material and old fan-favorites and rarities, showing that the Billy Corgan-led crew is still willing to risk losing an audience for a few minutes as it seeks to satisfy an artistic itch. Not everything may work, but the band — a sextet for Saturday’s performance — is still trying.
