Here is the video's description from YouTube:

Griffin is a 6 year old boy with severe Autism who lives in Calgary, AB. He has a passion for music, and has acquired an incredible love for Mr. Buble. He asks for 'Michael Buble' throughout the day, and his therapists use Mr. Buble's videos as rewards for good work.

Griffin goes to YouTube several times a day, types in Buble, and picks his favourite videos. He sleeps with Buble playing all night, and his therapists and parents have discovered that his music is incredibly calming when Griffin is overwhelmed or needs a sensory break. Mr Buble's music, and performances, truly speak to this remarkable little boy and has added so much to his life.

When Michael Buble heard about this young man, he recorded this special message and song. What a class act he is!! Thank you Mr. Buble for adding so much magic into Griffin's life.