A free app for Android, by Audio-editor.
What is Music Editor?
Music Editor is an audio editor that can cut out a certain part of a song and make it into a ringtone, notification tone, or alarm tone.
This app is very easy to use. Just select the part of the song you want to cut out, set the ringtone, notification tone, or alarm tone to that portion, and you’re done.
You can also make the volume of the audio or change the pitch.
There are lots of options to make the sound of the cut out portion different. You can add effects such as compression and fade to make it sound better.
You can also add different types of music to make it more interesting.