Next to Live and Let Die, Nobody Does It Better by Carly Simon is the best Bond theme song. Wiki:
“Nobody Does It Better” is a song composed by Marvin Hamlisch with lyrics by Carole Bayer Sager. It was recorded by Carly Simon as the theme song for the 1977 James Bond film The Spy Who Loved Me. It was the first Bond theme song to be titled differently from the name of the film since Dr. No, although the phrase “the spy who loved me” is included in the lyrics. The song was released as a single from the film’s soundtrack album.