Why is itunes deleting my music?

When i sync new music to my iphone, it automatically deletes some of the songs that were already on there, and i get frustrated, if i put a new song it means some other amazing song is going to be removed. Why is this happening? I have an iphone 4, and its updated and everything

Your old iPhone music gets removed… & a complete new itunes library is added on your iPhone… So if you remove a song from iTunes. It automatically gets deleted when synced next time…

I'm really sure why this happens, it's happened a lot with me too on my iPod touch, it's really annoying but it seems to be a stupid glitch…

  • Why is my iphone 4s music app deleting songs? Ok, so i just got on a bus to go back to college and i want to listen to my music on my iphone. When i open it and press shuffle, it just keeps rapidly going to the next tracks and then when i check the list of songs they are all being deleted one by one. I'm on ios 7. What the **** is this **** this is really stupid
  • Why is iTunes deleting my music every time I plug in my iPhone? I have my music in my music tab under itunes media. But, i have separate songs in my library. Whenever i add those songs from my library, it is fine. But when i decide to add my music from my tab, those other songs get deleted. Is there a way to freely edit my music without itunes constantly syncing?
  • Why downloaded music keeps deleting off an iPhone? Sometimes when I add new music into my phone (not from iTunes app) my older music would delete itself now I keep getting a pop up saying 31 items can't sync check iTunes but I don't know what to do and I can't put the music back into my phone Can someone help please
  • Why does my itunes keep deleting my songs including those imported from cd's? I added new songs on my itunes just last month when i opened itunes today to add more new songs to put on my iphone i found most of my albums gone including albums directly imported from the cd's how can i get them back