Default is 160kbps Ogg Vorbis, high quality is 320kbps. For the mobile app, it's 96, 160 and 320 for normal, high and extreme, respectively. Chromecast and th

Default is 160kbps Ogg Vorbis, high quality is 320kbps. For the mobile app, it's 96, 160 and 320 for normal, high and extreme, respectively. Chromecast and the browser-based player both use AAC, at a maximum of 256kbps.