And then there were 4. Tonight’s May 5 American Idol theme has the final top 4 singing rock songs, with special mentor Slash. What will rock week have in store for the remaining contestants?

Guns N Roses and Velvet Revolver guitarist Slash has been taking to Twitter to give some American Idol insight, sharing that “Those AI kids can sing their asses off, especially Adam.”

Rumors are also rampant that rock week will include the Idols singing duets along with their solos.

Tune in tonight for Adam Lambert, Allison Iraheta, Kris Allen and Danny Gokey for “rock and roll week.”

Slash also tweeted: “The approach I’m taking is different than usual on the show, and I’m going to make this as Rock & Roll an American Idol as possible, wish me luck!”

And the rock week selections pass Slash’s high standards: “The contestants from AI picked some really cool songs for next week, thank god!”