How to get music from my itunes account on my laptop to my iPhone?

Recently due to a virus I had to crash my laptop and I forgot to save my music on itunes.
After I got my laptop back up, I thought that if I reloaded all my music onto itunes and just plugged my iphone back into my laptop… All the music would be synced. I was very wrong and now I'm super upset cause all the music I had was deleted from my phone. The music is still on my itunes on the computer though. How can I get the music back on my phone?

" I thought that if I reloaded all my music onto itunes "

Reloaded it from where? Was your music saved externally? Mine is, which is why I can always restore it.

"… And just plugged my iphone back into my laptop… All the music would be synced"

It would be if you wanted that music on your compouter to actually go to the iPhone.

"all the music I had was deleted from my phone"

That's what happens when you sync. In over 3 years on my iPod, I have never synced. There are all sorts of headaches from syncing that you don't get if you use manual management of music and video (which I've used on iPhone 4 & 5). This has been a basic feature of iPhone for years, yet many iPhone owners insist on using sync to put music on a computer. Just check the box for manual management, block all the songs you want on your iPhone and drag the highlighted block to the iPhone tab on sidebar.

To transfer all the media (including non-iTunes purchases) on your iPhone back to the computer, see this -> Recovering your iTunes library from your iPod or iOS device.

You did now make & maintain a backup of you hard drive, correct?

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