With young students every week I sing a song together. They enjoy this method of learning, and I'm glad to see their faces! We do "Head, Shoulders, Knees and Toes" in Japanese. Also we do something called the "Sayonara" song. They can sing very well.
I also plan some games for every session. I think it gives students a lot of confidence.
I therefore believe that songs and games are good way to teach Japanese.