The Swiss Psalm temporarily became the national anthem in 1961. After a trial period of three years the Swiss tune was adopted indefinitely in 1965. The statute could not be challenged until ten years later but did not totally exclude the possibility of an ultimate change. A competition was set up in 1979 to search for a successor to the anthem. Despite many submissions, none of the others seemed to express the Swiss sentiment. The Swiss anthem finally got its definitive statutory status in April 1981, the Federal Council maintaining that it was purely a Swiss song suitably dignified and solemn. The popularity of the song has not been established. At least, it has been shown with several vox pops taken that many people do not know it at all, and only a small percentage can recite it all.