The EZ MP3 Cydia application will allow you to create custom playlists to listen to music over the internet. EZ MP3 works by accessing a large database of music which has been uploaded to various file hosting websites, allowing you to pick songs you want to listen to, then downloading them to your iPhone, iPod Touch or iPad for you to listen to in your playlist.
Note: The EZ MP3 application is still being created, and not all features are currently working. Additionally, this Cydia app is not yet compatible with the iOS 5 firmware. Check the developers official website for more details by clicking here.
If you are interested in EZ Mp3 you can find it through the ModMyi repo for FREE. Let us know what you think of EZ Mp3 in the comments section below.
Update #1: For a more complete Music downloading Cydia tweak click here.