How to get free music on iphone?

I have an iphone 4 and i want music on it. I have a computer with no music on it.
how do i get music for free on my iphone 4? Without an app, i want it in my music library like it would be if i bought it from itunes.

You can't. So i suggest you buy an android phone like a Samsung galaxy s2 and you can download loads of free music.

Sadly you can't.
For you to have music in your Library, you've got to download said music from iTunes.
Sorry.

Ehm Yeah you can. If you don't care about the illegality of it go to youtube-mp3.org in one tab and open YouTube in another. Search a song on YouTube copy its URL paste it into the space in YouTube-mp3.org and click convert video then download. There ya go. Save it's destination to documents then go into your documents and drag it into your iTunes library where it says music. Then connect your iPhone and sync. Easy!

Downloading free music on the iPhone will require the iPhone to have an internet connection either through Wi-Fi or a cellular connection such as Edge or 3G. Once the iPhone is connected to the internet you will need to download a program from Cydia that will enable you to download free music to your iPhone. If you wish to download free music to your iPhone you will need to have a jailbroken iPhone. If your iPhone is not jailbroken you are welcome to check out the guide to jailbreaking your iPhone before proceeding.

Open Cydia. Locate the brown Cydia icon on your iPhone's home screen and tap it to open the Cydia application. The Cydia icon is easily identified as a brown icon with a cardboard box in the center, surrounded by a circle.
Search for the program. Once Cydia has opened, tap Search on the navigation bar at the bottom of the screen. Enter the words MewSeek and press Search.
Install MewSeek. Tap MewSeek in the search results. In the upper right hand corner tap Install. Locate the button that says Confirm, again in the upper right hand corner. Tap Confirm and wait patiently while MewSeek completes the installation. Once finished, press the home button to return to the home screen of your iPhone.
Launch MewSeek. Locate the newly installed MewSeek icon on your iPhone home screen. Downloading free music on your iPhone is a breeze with MewSeek. Tap the MewSeek icon to open the application on your iPhone. Utilize the search box to search for free music and begin downloading free music to your iPhone. Tap the file in the search results to begin the download.