I am making a music player and I encountered this problem along the way.
local sound = soundService:WaitForChild("musicSound") sound.SoundID = musicID 15:47:50.025 - SoundID is not a valid member of Sound
You need to change "SoundID" to SoundId
Here:
local sound = soundService:WaitForChild("musicSound") sound.SoundID = musicID
Also, I recommend not putting the output in your code block.