Make any song as your ring tone. Here is an easy mp3 Cutter android application . This application lets you create personal ringtones, alarms, and notification sounds from existing music/audio files and record new ones using your Android device.Ringdroid includes the ability to read OGG Vorbis audio files, and it saves ringtones in AAC (.m4a) format.
Note: this app requests access to your contacts, but solely for the purpose of setting contact-specific ringtones. Source code is available at ringdroid.com.
The original open-source ringtone editor for Android, first published in 2008 and downloaded by millions of users worldwide.