user script for tampermonkey to change google music style for Microsoft Edge , https://www.microsoft.com/en-us/store/p/tampermonkey/9nblggh5162s?ocid=WinProd_soc_omc__tw_Link_lrn_10272016

googlePlayMusicDark.js

// ==UserScript==
// @name         GoogleMusicDark
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Google Music Dark Theme
// @author       Jose De Gouveia
// @match        https://play.google.com/music*
// @grant        none
// ==/UserScript==

(function () {
    'use strict';
    var bgColor = "#141517";
    var bgColorRGB = "20,21,23";
    var bgColorRGBA = `${bgColorRGB},0`;
    var fontColor = "#dcdcdc";
    var higlightColor = "#202125";
    var css = `
        a, h1, h2, h3, h4, h5, h6, span, p{
            color: ${fontColor};
        }
        .home-palette-id-1,
        .home-palette-id-2,
        sj-home .home-palette-id-1,
        sj-home .home-palette-id-2,
        .sj-scrolling-module-0 h2 a,
        sj-home[selected='0'] .home-palette-id-1,
        sj-home[selected='1'] .home-palette-id-1,
        sj-home[selected='2'] .home-palette-id-1,
        sj-home[selected='3'] .home-palette-id-1,
        sj-home[selected='4'] .home-palette-id-1,
        sj-home[selected='5'] .home-palette-id-1,
        sj-home[selected='6'] .home-palette-id-1,
        sj-home[selected='0'] .home-palette-id-2,
        sj-home[selected='1'] .home-palette-id-2,
        sj-home[selected='2'] .home-palette-id-2,
        sj-home[selected='3'] .home-palette-id-2,
        sj-home[selected='4'] .home-palette-id-2,
        sj-home[selected='5'] .home-palette-id-2,
        sj-home[selected='6'] .home-palette-id-2,        
        .sj-card-0 .sj-card#details > [slot='title'],
        .sj-card-0 .sj-card#details > [slot='subtitle'],
        .sj-card-0 .sj-card#details > [slot='description']{
            color: ${fontColor}!important;
        }
        [card-aspect-ratio='wide'].sj-card-0 .sj-card#details > [slot='title'],
        [card-aspect-ratio='wide'].sj-card-0 .sj-card#details > [slot='subtitle'],
        [card-aspect-ratio='wide']..sj-card-0 .sj-card#details > [slot='description']{
            color: ${bgColor}!important;
        }
    	body, body.material, body.qp {
    	    background: ${bgColor};
    	    color: ${fontColor};
    	}
        body.qp #material-app-bar #material-one-left .music-logo{
            background-image: url("play_music_logo_white.svg");
            background-size: contain;
        }
    	#player,.paper-toolbar-0,#backgroundColor {
    	    background: ${bgColor}!important;
    	}
    	.paper-toolbar-0 {
    	    border-bottom: 1px solid #111 !important;
    	}
    	.paper-icon-button-0[disabled] {
    	    color: ${higlightColor};
    	}
    	#gradient,.sj-home-0 #gradient.sj-home {
    	    background-image: linear-gradient(to top, rgb(${bgColorRGB}), rgba(${bgColorRGBA})), linear-gradient(to right, rgb(${bgColorRGB}), rgba(${bgColorRGBA})) !important;
    	}
        `;

    var node = document.createElement("style");
    node.appendChild(document.createTextNode(css));
    node.type = "text/css";

    var heads = document.getElementsByTagName("body");
    heads[0].appendChild(node);
})();