I just wanted to let you know that I just encountered this bug myself but at a slightly different time. For me the bug popped up as soon as I finished the "Get Emmitt to 30 music" quest. Other than the difference in timing the bug appears the same. This is with the current beta version v0.852 which I found on itch.io using a Win7 SP1 os.
An exception has occurred.
While running game code:
File "game/code/story_mode/story.rpy", line 1233 in script
File "game/code/story_mode/story.rpy", line 1233 in <module>
TypeError: wrotenewsong() got an unexpected keyword argument 'timbre'
Full Traceback:
File "game/code/story_mode/story.rpy", line 1233 in script
File "RockRobin\renpy\ast.py", line 806 in execute
renpy.python.py_exec_bytecode, self.hide, store=selfstore)
File "RockRobin\renpy\python.py", line 1577 in py_exec_bytecode
exec bytecode in globals, locals
File "game/code/story_mode/story.rpy", line 1233 in <module>
TypeError: wrotenewsong() got an unexpected keyword argument 'timbre'
Windows 7.6.1.7601-SP1Ren'Py 6.99.10.1277