AppleScript and JXA scripts to get Now Playing info. Works on macOS 15.4+.

now-playing.js

function run() {
	const MediaRemote = $.NSBundle.bundleWithPath('/System/Library/PrivateFrameworks/MediaRemote.framework/');
	MediaRemote.load
	
	const MRNowPlayingRequest = $.NSClassFromString('MRNowPlayingRequest');
	
	const appName = MRNowPlayingRequest.localNowPlayingPlayerPath.client.displayName;
	const infoDict = MRNowPlayingRequest.localNowPlayingItem.nowPlayingInfo;
	
	const title = infoDict.valueForKey('kMRMediaRemoteNowPlayingInfoTitle');
	const album = infoDict.valueForKey('kMRMediaRemoteNowPlayingInfoAlbum');
	const artist = infoDict.valueForKey('kMRMediaRemoteNowPlayingInfoArtist');
	
	return `${title.js} — ${album.js} — ${artist.js} | ${appName.js}`;
}

now-playing.scpt

use framework "AppKit"

on run
	set MediaRemote to current application's NSBundle's bundleWithPath:"/System/Library/PrivateFrameworks/MediaRemote.framework/"
	MediaRemote's load()
	
	set MRNowPlayingRequest to current application's NSClassFromString("MRNowPlayingRequest")
	
	set appName to MRNowPlayingRequest's localNowPlayingPlayerPath()'s client()'s displayName()
	set infoDict to MRNowPlayingRequest's localNowPlayingItem()'s nowPlayingInfo()
	
	set title to (infoDict's valueForKey:"kMRMediaRemoteNowPlayingInfoTitle") as text
	set album to (infoDict's valueForKey:"kMRMediaRemoteNowPlayingInfoAlbum") as text
	set artist to (infoDict's valueForKey:"kMRMediaRemoteNowPlayingInfoArtist") as text
	
	return title & " - " & album & " - " & artist & " | " & appName
end run