So far, I'm not finding issues in Big Sur 11.2. I don't use Lead Sheets so I'll check that.
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BIAB 2021 Audiophile iMac Pro 4TB 128GB SSDx2 Catalina; 2012 MBP Catalina
Overture 5 DP 10 LogicProX Finale 26, Encore 5.0.7 SmartScoreX2P Notion 6
Legacy G4-1K DP OS 10.4.11/OS 9.2 Apps