I have for example artists named Blue Knights. In my itunes library I show three albums for a total of 21 songs. When I bring up the sonos app on my macbook pro, and load music library, it only show one of these albums that has five songs. I've gone to manage settings, and updated music library now about five times .... still same results. I've gone to music library settings, removed the library, and added it again .. three times ... still same results. I checked the rest of the artists that are listed in Sonos, and it seems to be missing about 12 other artists and songs of those artists that I have in my itunes library. Considering giving up on Sonos and returning play5 and bridge to retailer. Anyone interesting in buying this system from me. Previously I asked a question of why when I shut off my macbook pro the music still plays, and never received a response from sonos. This type of support and product doesn't seem to be worth the monies.