On January 8, I had my 23 year-old left replaced knee re-replaced with a new model which should last much longer, but at 77, how much longer do I have? Anyway my MQ/BH/Blumenstein system is providing wonderful music for exercise and rest during recovery. Thanks to the BH team, and especially PB, who built it for me. Bones heal better with Music! Cheers from Hank in Eugene