The semi performances will be the same in the final for those that make it. There are 6 that have already made it though to the final, most because they pay to.
The big 5 are German, United Kingdom, France, Italy and Spain and they are the the biggest financial contributors to the EBU. Denmark also Auto qualify for the Final because they allegedly sent the best act last year, they were at least determined to be the winner of last years contest.
so these are the other 6 rehearsals.
( Auto-qualifiers for the final )