Deleted songs on iTunes, iPhone 4, replacing music?

I had to swear off my computer which deleted all my songs on iTunes that I also had on my iPhone 4, if I add new songs to my iTunes and downloaded them to my iPhone will my previous songs on my iPhone be deleted?

In fact, once you've put the songs or video on iPod or iPhone, you can get them out of iPod or iPhone and put them on computer.

If the songs are purchased from iTunes. You can easily transfer them to iTunes or computer by clicking "Transfer purchase". If your stuff are downloaded from other website. You can transfer them to computer with iPod transfer. Like this one

  • Will replacing my existing laptop hard drive affect my iTunes/iPhone? I'm pretty sure I already know the answer but with me possibly losing my data from the main 2 devices I use in life I want to be sure. I've made a system image using windows 7's built-in backup software and will be replacing my faulty hard drive with a larger capacity new one. Seeing as it's a full system image it should save all the iTunes program data, settings, media (songs/videos) and iPhone backup shouldn't it?
  • Why do songs get deleted from my iphone when i sync it to my itunes library? Everytime i sync my iphone (5) to my itunes library, all the songs i had just recently bought on my iphone get deleted and if i try to re-purchase it on itunes it just says "purchased." Somtimes i will even try to re-purchase it from my laptop and even though the purchased song it in my library, it doesn't transfer to my iphone.
  • Why did ios 7 put music on my iphone when i had deleted or removed these songs prior? So I had deleted or removed songs from my phone that i just didn't like anymore or got tired of. They were still on the computer and in the icould service but they didn't show up on the physical phone device itself. Now after ios 7 everything from the cloud is basically on my phone and i don't want them. Is there a way to reverse this or will i have to go through my entire library and hand delete the songs?
  • When I updated to ios 9 on my iphone my songs on my itunes playlist got deleted. Why? When I updated to ios 9 on my iphone 5s over half of the songs on my one of my favorite/largest itunes playlists. Why?