How to I get music from my computer to my iPhone 4?

I got an old iphone 4, and I plugged it in to my computer. Itunes said it can't sync with the phone because the itunes was out of date, but when i tried downloading a newer itunes, it said the computer was too out of date. So I don't know how to get music onto my phone.

There are alternative apps you can use just look one up. I'd much rather have it on my actual iPod app but since for you that's out of the question, getting an alternative is an easy and fast way to get music that you can keep. Not to mention it's all free. Hope i helped! - Matt