I'm currently in the process of transferring my CD collection into FLAC files to play it through my Sonos system, made up of a number of Play:1 connected through a BRIDGE.
I have written a custom script on Linux to do the conversation and tagging so are in total control over what tags to apply to the resulting audio files.
For MP3 files in the past I have been using the TCMP=1 tag to signify a compilation album and using 'Use ITunes Compilations' under Manage Music Library as I like the layout of having the artist name underneath the title for the track listings.
Is there a comparable tag for flac files that Sonos supports? The research I've done on the Internet suggests that, whilst iTunes does not support flac files, both COMPILATION=1 or ITUNESCOMPILATION=1 may work, but I've tried these on my Sonos system with success.
I've used the ENSEMBLE tag set to 'Various Artists' and 'Use Album Artists' set, but as above I really want the the layout of having the artist name underneath the title for the track listings which only appears to be offered under iTunes Complations.
I've tried asking the question direct to Sonos but disappointingly that say that they are not able to help, despite as you might expect being the only people that could answer authoritatively as they wrote the code.