Create a bookmarklet and click it or paste in console show song name as notification when song changes

ytmusic-nowplaying

javascript: (function () {
    if (window.location.host == 'music.youtube.com') {
        Notification.requestPermission().then(function (permission) {
            if (permission == 'granted') {
                document.querySelector('#progress-bar.ytmusic-player-bar').addEventListener('value-change', function (event) {
                   if(event.srcElement.value == 1) {
                       new Notification(document.querySelector('.title.ytmusic-player-bar').textContent, {
                        icon: document.querySelector('img.ytmusic-player-bar').src,
                        body: document.querySelector('.subtitle.ytmusic-player-bar').textContent.trim().split('•')[0]
                       });
                   }
                });
            }
        });
    } else {
        alert('Use this only when the youtube music tab is active');
    }
}());