Motifs in the James Bond film series title sequence for "Spectre". A contemporary artist usually sings during the title sequence and an instrumental version of the main track may also be featured as a leitmotif during the film, which repeats in various moods. Writing for "Rolling Stone", Andy Greene says that "James Bond title songs, as a rule, have the name of the movie in the chorus," though he notes that this is not always the case. "On Her Majesty's Secret Service" has an entirely instrumental credit sequence, though the film features an alternate theme, "We Have All the Time in the World", sung by Louis Armstrong.
James Bond have also been two independent productions of Bond films: "Casino Royale" (a 1967 spoof) and "Never Say Never Again" (a 1983 remake of an earlier Eon-produced film, "Thunderball"). In 2015 the series was estimated to be worth $19.9 billion, making "James Bond" one of the highest-grossing media franchises of all time. The Bond films are renowned for a number of features, including the musical accompaniment, with the theme songs having received Academy Award nominations on several occasions, and two wins. Other important elements which run through most of the films include Bond's cars, his guns, and the gadgets with which