Setting message tone

I know you can set music tones as ringtones , but as far as message tones such as notification and text, Idk if that is possible without downloading a third party app.

But to set music as ringtones, simply go to the music you want and tap the tab with 3 dots (...) and drop down menu should show with a "set as ringtone" option
 
Recommend checking out Zedge from the play store, it's got lots of ringtones, message tones, wallpapers,
 
I want to use a tone in my music as a message alert on my M8. But it only allows default tones. Any ideas. On my M8
You can use any audio for both ringtones and notifications.. I put them in the Media folder on my SD card>Audio>Notifications. When I open up the ringtone list for Notifications their there.