Good Iphone music apps (to download music)?

So I basically am looking for apps to download free music, since music costs so much in the Itunes store now.

Here are some things I'm looking for in an app:
- NO monthly cost (only one time payment for the app***
- NOT a radio service; rather downloading music (or listening to any song for free)

i don't know if such an app exists, but any good music apps you know/use that closely fit the description would be great!

please just tell me the name of the app, along with a short description

IDownloader. App has a blue background with a black arrow pointing down. It is simply a nice app. You go on the Browser tab on the app, chose a downloading website such as mp3skull.com (which I use) then find your song, click download, once finished there one the files tab of the app and you can play them from there. If you want to move them into your actual music library you plug you iPhone into computer, go on iTunes, wait for your iPhone to be recognized then once it's done everything like syncing and what not, click on the phone button click on apps, scroll to the bottom where you'll see iDownloader.click it, the songs will pop up the you highlight them and click "save to" and then chose a folder to save the songs to. Once done copying songs into your desired folder go under files on iTunes, click add file to library then find your desired folder you saved those songs to and add them to your music library.done.sync. After go on to iDownloader app on your phone and delete the song because you'll have it in your library. Also you'll have to do this because iDownloader will only let you donwload 15 songs for free then it wants you to buy the full version, so doing that method will allow you to keep downloading songs for free!