Thanks for all your responses. For everyone who's questioning my sanity... The limits within the Sony player restrict playing tracks to a single genre, year or rating etc. and the 'Bookmark' facility is limited to 100 tracks. Dynamic Playlists in SonicStage can combine tracks into single user specified groups, such as a specific decade as maxthrusters did. A great facility. FYI, transferring playlists doesn't transfer the actual music files, just playlist information so it's not taking up any precious space. Cheers.