Laws vary from state to state and country to country. I don't know of any legal jurisdiction in the world that has such a penalty.
You can get music on a mp3 by downloading it from internet.
http://www.youtube-mp3.org/
the best site for downloading mp3 in all the languages is www.worldhitz.com
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It is possible to get in trouble for downloading free mp3 music because it is illegal. Ussually you do not get caught though. It is up to you to make the choice.
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MP3 Rocket Basic is free and can be downloaded from the main website (see related link). MP3 Rocket Pro must be paid for. If you find it anywhere for free, you should know that it is an illegal/pirated copy.
There are a few places where someone can purchase Mp3 files. Some of these places include; from someone else, eBay, and Amazon. Although some Mp3 files may be copyrighted, someone purchasing or selling Mp3 files needs to verify that the files are not pirated.
The Android app that lets you play Torrent mp3 as a whole CD one after another without downloading is tTorrent Lite.
If you are paying for it then it's legal. To save the hassle and be safe, use Itunes because they are licensed mp3 files. Rhapsody is the same thing but their push is they let you listen to the whole song before downloading. I would stick to well known mp3 downloaders like Itunes and Rhapsody rather then getting into the mess of the thousands of other mp3 downloading sites that may or may not be legal. For more information on how to decipher between mp3 legal issues check out http://www.mp3licensing.com/
Try this website for downloading free mp3 ringtones: gallery.mobile9.com/c/mp3-ringtones/1/. I have sen alot of people recommend this but have not used it myself yet.
You can by downloading an app on your PC/laptop then plugging your mp4 into it and downloading on your mp4. (it wont work if you have an mp3 it must be mp4)