Potty Training a stubborn boy!

I used to do the singing thing too, it does help alot. You could also try to make a poster on oaktag and hang it in the bathroom, put the days of the week and get some stickers and everytime he goes let him place a sticker on the poster. You could also try the "sink the cheerios" game, place some cheerios in the toilet and tell him to try to sink them when he goes pee pee. I know it sounds funny, but kids think it is a game, it does work. Good Luck and don't worry, you will get there.

if he goes in the potty try singing and dancing around in circles, praising "pee pee in the potty, pee pee in the potty bob went pee pee in the potty yaaaa"