There's lots of free and legal music online; once you download Music Box, it’ll allow you play and download any music you want at many legal music sites using muti-threading and resuming download capability! You can get all this music for free!

Features: 

Web browser 
- Tap and hold on an image to download it 
- Provides a user experience very similar to Mobile Safari 
- Full screen mode 
- Bookmark manager 
- Address bar auto-completion 

Download Manager 
- Multiple downloading at one time 
- Fast Downloading speed 
- Support resuming of interrupted downloads. 
- Delete or Clear while downloading 

Music Files manager 
- Folder manager 
- Select all or Unselect all 
- Move, rename or delete files and folders 
- Search by file name 

Music Player 
- Best cool UI 
- Repeat and shuffle songs 
- Playlist support 
- Background playback (iPhone 3GS, iOS 4.0 or later) 
- Ability to play music in a folder like an album 

Music File sharing 
- Transfer files to PC use iTunes 
- Import files to iPhone use iTunes 

For the best performance we recommend to upgrade to the latest version of the iPhone OS (IOS 4.0 and up).