To reproduce:
On 1.20.1, use LATEST Sound Physics Remastered and this music player. Full disclosure, I used "Create: Songs and Speakers", but these are identical versions.
Attempt to play music via an in-world player (Such as the speaker), and it will crash generating a client crash report. Removing Sound Physics Remastered resolves the issue.
It appears this is due to a method in Sound Physics Remastered which was renamed.
crash-2026-02-25_22.42.47-client.txt