Burns worked for the final seven years of his life on projects to preserve traditional Scottish songs for the future. In all, Burns had a hand in preserving over 300 songs for posterity, the most famous being "Auld Lang Syne". He worked on this project for James Johnson's the Scots Musical Museum (1787-1803) and for George Thomson's five-volume "A Select Collection of Original Scottish Airs for the Voice". Burns had intended the work to be published as part of Thomson's selection. However, he wrote to a friend that Thomson and he disagreed on the merits of that type of song. "What to me appears to be the simple and the wild, to him, and I suspect to you likewise, will be looked on as the ludicrous and the absurd."