Music app's ringtone trimmer if you want to set only a part of the song as ringtone.
Now playing screen, press and then tap
Drag the trim sliders to the part where you want the ringtone to begin and end.
For a more precise trimming, tap the left or right arrow buttons . Time markers indicate where you are on the song.
When you're done trimming, tap
Choose whether to set your trimmed song as your
Phone ringtone or
Tip: From the Home screen, when you press and then tap
, you'll see your trimmed song in the ringtone list.