This only works if you have a respec kit device!
Currently when publish 28 comes out, Entertainers will be a combat class. This means that they will no longer be stuck at lvl 1 but can go all the way up to 90. If you purchase a proffesion restart kit, and pick entertainer you will start out at lvl 1. Get a macro that automatically makes you dance and do flourishes to get you exp. Let this run all the time and you should be lvl 90 in no time. Now use your respec kit device to change to what ever proffesion you want and whallah you are a lvl 90!!