Prizes
Grayson has competed internationally in Virtuoso Entertainment and Classical categories.
His successes include:
2010
| 1st | Trophée Mondial Senior Classique |
| 1st | Spoleto Senior Variete and Senior Classic |
2009
| 1st | Roland International V-Accordion Competition & Festival |
| 1st | Coupe Mondiale |
| 1st | Coupe Mondiale Virtuoso Entertainment |
| 1st | Primus Ikaalinen International TV Competition - Finland |
| 2nd | Trophée Mondial Senior Classique |
| 2nd | Klingenthal Category 6, Virtuoso Entertainment |
2008
| 1st | Castelfidardo Category D Senior Classical |
| 1st | Trophée Mondial Senior Varieté |
| 2nd | Trophée Mondial Senior Classique |
2007
| 3rd | Coupe Mondiale Piano Accordion Category |
| 3rd | Category D, Castelfidardo International Competitions |
2007/8
| 1st | New Zealand and South Pacific Accordion Champion |
| 2nd | Klingenthal Category 6, Virtuoso Entertainment |
Scholarships
| 2017 | Max D. Jost Prize for achieving full marks for his Master recitals |
| 2016 | Won the Nicati de Luze Foundation Scholarship |
| 2015 | Bachelor Graduation Scholarship paying first year’s tuition of Master’s Degree |
| 2012 | Accordion Examination Board of New Zealand Scholarship |
| 2009 | AIMES Excellence in Music Award |