Q: how do I delete an album that my son accidentally downloaded to my iphone 5

Hello, passout99. 

Thank you for visiting Apple Support Communities.

Here are the steps on how to delete music from your iPhone.

iPhone, iPad, or iPod touch

Before you delete, find out if you'll be able to download the song you deleted again (it depends on where you live). To delete a song:

1. Tap the Music app.
2. Tap the Songs category.
3. Swipe left to right over the song you want to delete.
4. Tap Delete.

How to delete content you've downloaded from the iTunes Store, App Store, iBooks Store, or Mac App Store

http://support.apple.com/kb/HT5772

Also, there is a new feature in iOS 7 that shows you all your purchases made with your Apple ID.  To disable this feature go to Settings > Music, then turn off Show All Music.  This information can be found on the user guide below.

iPhone User Guide

Cheers,

Jason H.