The BBC reports today that Leona Lewis has been tapped to sing the theme song to James Cameron’s upcoming I-see-blue-people sci-fi epic Avatar, with the help of James Horner and Simon Franglen, the team who blessed/bedeviled the world with Celine Dion’s deathless chest-pounder “My Heart Will Go On” for Cameron’s Titanic back in 1997.

While Lewis prepares to bust her wing span on whatever the outer-space equivalent is of a ship’s prow, we’re compelled to take a look at the good, the bad and the ugly in movie theme songs, including—cue coyote flute— soundtrack king Ennio Morricone’s actual theme song for the 1966 Clint Eastwood spaghetti-western classic The Good, The Bad and the Ugly.

There’s great schlock (Whitney’s Bodyguard epic “I Will Always Love You”; Phil Collins’ “Against All Odds,” for the 1984 movie of the same name; Bill Medley and Jennifer Warnes’ Dirty Dancing duet, “(I’ve Had) the Time of My Life”;), and schlock schlock (Aerosmith’s execrable Armageddon smash “Don’t Wanna Miss a Thing,” Bryan Adams’ Robin Hood: Prince of Thieves mom-slayer “(Everything I Do) I Do It For You”).

Everyone has an ingrained soundtrack memory, whether they be Ghostbusters, Grease-ers, or Gangstas; the James Bond catalog alone could keep us busy for days. Is it Dolly Parton’s “9 to 5” cup of ambition? Jaws‘ infamous, ominous duhn-DUHN? Eminem’s Detroit fever-dream “Lose Yourself”?

Let’s kick off the debate with a little “Flashdance,” shall we? Then take your passion and make it happen in the comments section below:

Which artists have brought the most music magic to the big screen? Who should be stripped of their celluloid privileges forever? (Will Smith, you’re on notice.) And where will Leona’s entry fall in the pantheon of blockbuster theme songs?

(Follow the Music Mix on Twitter: @EWMusicMix.)

Rihanna’s violent, disturbing ‘Russian Roulette’ video: How dark is too dark?