When you say manage your music, I am presuming you are referring to managing your current music collection that is on your PC. If I am correct, then you should be familiar with Windows Media Player, which IMO, would be your best management option. Your Nexus 7 is recognized as a MTP Device (Media Transfer Protocol) when connected to your Windows computer allowing you drag your selections into the sync box for your Nexus 7 and then click sync to transfer the selections. Remember if your music content is mp3 format they will play in your native media player on the Nexus 7, but if they are WMA's you can choose to convert them to mp3's or download the WinAmp app from Google Play, which will play WMA's, from what I understand.