Spectre director Sam Mendes says the latest Bond theme has already been recorded, but we're still none the wiser as to who'll be crooning over the film's opening credits.

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Ahead of the announcement of Spectre's theme song, we look at the contenders to follow in the footsteps of Shirley Bassey, Paul McCartney, Tina Turner et al.

1. Ellie Goulding



Why it could be them: No stranger to movie soundtracks, Goulding has lent tunes to everything from About Time to The Hunger Games: Catching Fire and Fifty Shades of Grey. Her ethereal voice would certainly add an interesting flavour to Spectre, and Sam Smith certainly seems to think she has it in the bag.

Most Bondian track: 'My Blood'

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2. Adele



Why it could be them: The 007 producers successfully brought back director Sam Mendes after he initially turned down the job, so could a return for Adele - who bagged an Oscar for 'Skyfall' - also be on the cards? There is a precedent for bringing back artists - Shirley Bassey recorded three Bond tunes across a 15-year period: 'Goldfinger', 'Diamonds are Forever' and 'Moonraker'.

Most Bondian track: 'Skyfall', of course!

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3. Lana Del Rey



Why it could be them: Rumoured for the gig as far back as 'Skyfall', Lana Del Rey has the kind of distinctive vocal style (and worldwide recognition) that'd make her a great addition to any Bond theme compilation album. She also has strong ties with film having penned 'Young and Beautiful' for The Great Gatsby and provided two songs for Tim Burton's Big Eyes.

Most Bondian track: 'Million Dollar Man'

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4. Sam Smith



Why it could be them: The apparent frontrunner for months, Smith recently ruled himself out of the job (tipping Ellie Goulding for it in the process) and recent vocal surgery suggests that recuperation might be his top priority. However, Smith's denial could be a diversionary tactic to throw everyone off the scent.

Most Bondian track: 'Life Support'

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5. Florence + the Machine



Why it could be them: There's always been a sense of the widescreen epic about Florence's music, and if her Glastonbury set proved anything it's that she's still got big appeal to a diverse audience. Florence is currently doing the rounds promoting How Big, How Blue, How Beautiful, meaning that fitting in a Bond track could be difficult - but, it would be an opportunity to raise the profile of her album.

Most Bondian track: 'What Kind of Man'

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6. Radiohead / Thom Yorke



Why it could be them: A wildcard entry for sure, but both Sam Mendes and Daniel Craig are reportedly big fans of Radiohead, with the latter even turning journalist for a Q&A with Thom Yorke in Interview Magazine. Some combo of Radiohead/Yorke isn't entirely out of the question, particularly as one of the group's more memorable covers happens to be Bond-related.

Most Bondian track: 'Nobody Does It Better'

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7. Thomas Newman



Why it could be them: Admittedly this is highly unlikely, but could Spectre go full-on instrumental for the opening credits ala Dr No and On Her Majesty's Secret Service? The trailer for Spectre used a motif from OHMSS, so could that be an indication that Mendes and Newman want to try something different? After Skyfall's huge success, it certainly feels like they'd have free rein to give it a go.

Most Bondian track: The Skyfall soundtrack is a good start!

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Who would you like to see take on the Spectre theme? Leave your comments below.

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