The ONLY Way To Find Natural Vibrato (Nothing else really works) 

Free Voice Lessons: chrisliepe.com/free-your-voice/
My Website: chrisliepe.com
When it comes to vibrato, it certainly seems like some singers just 'have it', while others (maybe you who are reading this) just don't.
...And it doesn't seem like any amount of searching for it or experimenting helps you find it.
Why is that some just 'have it' and are able to use it musically and tastefully? Well, I'm not one to leave this nagging question alone. I'm never satisfied with the "They just have it" throw-away, shutting-the-mind-off approach :)
The truth is... You can't find your vibrato. IT FINDS YOU!
And it only finds you when you create the right environment in your singing and mindset for you to LET it show itself.
In this video, I share some easy exercises and experiments you can do to get your voice and mind in the right posture to summon (and then use) natural, musical vibrato.
Be patient and remember to really FEEL and experience your voice during the exercises I show you!
...And then go listen to a Joe Cocker playlist and see if you can hear the exercises I demonstrate at work :)