Arrange the four dances first, and then form five empty seats, so that two crosstalk and three solos can be inserted. The result is that there must be a program between the two dances, but there may be two programs or one program between the two dances, and your method is missing a category. So in this problem, we can only arrange two cross talks and three solo dances first, and then insert four dances, that is, A (5,5) A (6,4). The arrangement method of total *** 120*360=43200.