I have albums on my NAS that are tagged correctly. MP3, FLAC and AAC. Sometimes, Sonos Library doesn't recognise Disk 1 and Disk 2 tags and puts them all together. But as
Froese & Haslinger - Alpha (Synthesizer Greatest Vol.5 by Star Inc.) - YouTube
Stream Vangelis - Alpha (Ricardo Falquina Remix) by Ricardo_Falquina | Listen online for free on SoundCloud