Top 15

COMP WARS: It definitely looks like another nail-biter going into the weekend, as projections for both Now 51 and the Guardians of the Galaxy: Awesome Mix, Vol. 1 soundtrack remain tight. Both compilations should have a strong weekend. Now (featuring Katy, Ariana, Iggy, Sia, Sam, KONGOS and other chartbusting faves) releases always trend well, and Guardians (Jackson 5, 10cc, Raspberries, Rupert Holmes) will likely see another spike from the film's second weekend; for the time being, Disney’s Marvel-backed oldies mix gets a slight edge. Here's how it looks headed into the weekend:

Guardians of the Galaxy: Awesome Mix, Vol. 1 (Hollywood) 95-100k
*Now 51 (NOW) 90-95k
*Godsmack (Republic) 45-50k
5 Seconds of Summer (Capitol) 35-40k
*Spoon (Loma Vista/Concord) 30-35k
Frozen (Disney) 30-35k
Sam Smith (Capitol) 27-30k
Eric Clapton (Bushbranch/Surfdog) 25-28k
Tom Petty & The Heartbreakers (Reprise) 24-27k
*The Vamps (Island) 20-23k
Ed Sheeran (Atlantic) 18-21k
Kidz Bop Kids (Razor & Tie) 17-19k
Brantley Gilbert (Valory) 16-18k
Now 50 (NOW) 15-17k
Miranda Lambert (RCA Nashville) 13-15k
Luke Bryan (Capitol Nashville) 13-15k

*Debuts

In other compilation news, President Glauber's Birth-Week Prog Mix includes "The Revealing Science of God/Dance of the Dawn," "The Return of the Giant Hogweed," "Babs and Babs," "In the Wake of Poseidon," "La Villa Strangiato," "The Advent of Panurge" and "Tarkus." (8/7p)