Q: iPhone music

Hi joanfromcolumbus,

If it is purchased music from iTunes and it is still available you can download it from the cloud when you want.

And to delete it from your iPhone.

1.     Tap the Music app.
2.     Tap the Songs category.
3.     Swipe left 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

Best Regards,

Nubz