I have my music library both on my PC and uploaded to Google Play. Some of my albums have names with non-English characters (e.g. "Pärt"). Using the Sonos controller (both Mac and Windows) to search my music library for "Part" (note the use of "a" instead of "ä"), it successfully finds matches in the album name. However, if I do the same search against Google Play, the search fails. If I do the search directly at http://play.google.com/music, the search does succeed. This leads me to believe the problem is in the Sonos controller. Seems like a bug.