Based on the clue 'come on get this answer their theme was come on ge...', what is the answer?

What is associated with: come on down this goodson todman game show made its debut on november 26 1956? What is referred to by 'come on down'? Based on the clue 'come on get happy was one of its theme songs', what is the answer? What is referred to by 'come on get happy'? Based on the clue 'come on hit me harder harder', what is the answer? Based on the clue 'come on in for our monday special flapjacks topped...', what is the answer? Based on the clue 'come sail away as we set off on this river that ac...', what is the answer? Based on the clue 'come sail away with charon on this river a greek w...', what is the answer?