Ring Tones in Android

To be able to add and change the ring tones in Android follow these steps:

-To calls: create a folder named "ringtones";
-To messages (notifications): create folder named "notifications";
-To alarms: create folder named "alarms".

I create the folders in "/sdcard/media/audio".

Just put the files .mp3 in the respective folders and the new ring tones are available in the selection lists.