Much like Jurassic Park. But, I said this because there's a lot of fans who are upset because it's not going to be exactly like the book, and are panicking at such changes like how Wade and Art3mis meet in the real world (as in the book, they finally meet after the contest is over, whereas for the Empire Magazine picture, it appears to be much sooner). I say give the film a chance and then make the judgment. And it's not like they're completely ignoring the book, as Cline is involved with the script and knows what he's doing.
As for the Rush and 1970s Rock, it's in relation to Halliday, the creator of the OASIS and the contest. Halliday is stated to be a fan of Rush, and to find the key for the second gate, he uses a recreation of Syrinx from Rush's album 2112 (which is stated to be his favorite). I'm personally not a fan of Tom Sawyer, but hopefully they'll use another song in the actual film. When it comes to the setting of the story, due to Halliday's obsession with the 1980s and it tying into the egg hunt, 1980s music has come back (and since the score is going to be done by Alan Silvestri, who gave use the scores for Back To The Future, The Abyss, Predator, Predator 2 and Captain America: The First Avenger, The Avengers and Captain America: Civil War. So, it will most likely be an orchestral score like most of Spielberg's 1980s films.
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