No disrespect to the musicians who have exceptional technique, or to those that love 'complicated music', but my real ear opener was when I was working as a teenager in a record shop. At the time I was learning guitar, and getting into the likes of Alan Holdsworth and John McLaughlin. I was playing an Al DiMeola album in the shop when one of the bosses said 'this is good and very clever, but it doesn't swing'. He then put some Count Basie on. I genuinely think that moment transformed the way I thought about music.