Scripting Apple Music on macOS for chorus repetition practice

This is an update to my previous post on automating iTunes on macOS to support chorus repetition practice. You can read the original post for the theory behind the idea; but in short, one way of developing prosody and quality pronunciation in a foreign language is to do mass repetitions in chorus with a recording of a native speaker.

Because in macOS 10.15, iTunes is no more, I’ve updated the script to work with the new Music app. It turns out that it’s a lot simpler. No need to dive into the application classes.

--	Created by: Alan Duncan
--	Created on: 2020-07-04
--	Copyright (c) 2020 OjisanSeiuchu
--	All Rights Reserved

use AppleScript version "2.4" -- Yosemite (10.10) or later
use scripting additions

property trackDuration : 1
property minimumVolume : 10

--	initial volume, set by user
global volume0, trackRepeatMode0

on run
	tell application "Music"
		-- save original settings
		set trackRepeatMode0 to song repeat
		set song repeat to one
		set volume0 to sound volume
		--	calculate the delay between fades
		set fadeDelay to (trackDuration * 60) / (volume0 - minimumVolume)
		repeat with i from minimumVolume to volume0
			delay fadeDelay
			set sound volume to sound volume - 1
		end repeat
		-- restore original settings
		set song repeat to trackRepeatMode0
		set sound volume to volume0
	end tell
end run