Halberstadt 2024
David Halberstadt Obituary (2023) - Champaign, IL - The News-Gazette Legacy.com
‘There’s a certain madness to it’ … fans await new chord in John Cage gig with 616 years left to run The Guardian
Booz Allen Veteran Kathleen Halberstadt Henry Joins ManTech as Finance & Business Operations VP GovCon Wire
A 639-year-long John Cage organ performance strikes a new chord in Germany NPR