People stopped using ringtones because modern music is a steaming pile of ....
Watch this video...
"Why is music so bad?"
I, personally, use AC/DC "Thunderstruck" as a ringtone.
The whole song.
The opening riff sounds as a ringtone anyway, and if I don't answer, people will be subjected to an appealing cacophony, at least, written in the seventies.
Of course, Mr. Pavlov got me, because now I instinctively reach for my phone whenever I hear that song anywhere else.