ESC 2016 SWITZERLAND: THE FINAL TONIGHT

Remember Switzerland who chose it's six finalists in various selections already ages ago? Well, it feels like ages ago but the final's going to be tonight. Six artists and songs are left and all six are going to perform also another song, a cover. What's the purpose of that at this stage if not only to fill in some spare time? I don't know but maybe Swiss television thinks it's a good idea....