Hi, thanks for the reply ...maybe a more lengthy explanation. i edited the tracknumbers on my PC (with Windows Media Player) and copied the songs to my smartphone where they showed in the correct order. That was ok. Then i noticed with the iTag app that some songs didn't have a tracknumber (according to iTag). I added with iTag the correct tracknumber for 1 song and now that song appears in Play Music on top (it was maybe stupid to use iTag). I deleted that particular song from my smartphone and copied it again from my PC, but the problem persists,