In case you don't like the default ringtones that are pre-installed on your Android smartphone, and you don't want to make your own ringtones
(either by actually composing them, or by cutting pieces from your favorite songs), there are many apps out there that offer a great variety of pre-made ringtones. Most of these apps offer ringtones with specific themes, but, of course, there are also some that include more general sounds.
All of the apps presented below are free, and have ratings of at least 4 stars in Google Play. Check them out (in alphabetical order):
Some of the best ringtone apps for Android