Politics and music have been natural partners for more than 200 years in this country. Some early campaign songs paired new lyrics with familiar tunes ("Adams and Liberty" or "Jefferson and Liberty") to provide voters with substantive messages. Others, especially in the 20th century, adopted popular songs as campaign jingles, associating candidates with a sunny optimism but without any particular agenda (FDR's use of "Happy Days are Here Again" or Clinton's of "Don't Stop Thinking about Tomorrow").