Q: after updating to IOS 7 I keep losing music

Hi lisafalk,

Welcome to the Support Communities!

It sounds like these songs are having issues downloading from iTunes in the Cloud. To troubleshoot, do the following:

Try signing out of your account in Settings > iTunes & App Store. Once signed out, go ahead and restart your iPhone, then sign back in.

iOS: Changing the signed-in iTunes Store Apple ID account

http://support.apple.com/kb/HT1311

iPhone, iPad, iPod touch: Turning off and on (restarting) and resetting

http://support.apple.com/kb/HT1430

If you continue to have issues, there may be an interrupted download that is preventing other content from downloading. See the following article to resume any interrupted downloads:

iTunes: How to resume interrupted iTunes Store downloads

http://support.apple.com/kb/HT1725

If the music has been purchased from the iTunes store, you may be able to download the music directly to your device:

Downloading past purchases from the App Store, iBookstore, and iTunes Store

http://support.apple.com/kb/HT2519

Also, this process can be set automated in order to automatically download any future purchases to your iPhone.

iTunes Store: How to enable Automatic Downloads

http://support.apple.com/kb/HT4539

I hope this information helps ....

Happy Holidays!

- Judy