From TopIdol:

As I reported before, the Top 4 will be performing Rock songs next week.

However, I’ve also heard the ouvre will be limited to classic rock, i.e.,
songs of the 1970s-80s. Slash (!!!!) will also be the mentor, as originally
repoted by Idolator.

This week, the contestants WILL BE doing TWO songs, however…in another
twist differentiating this season’s Top 4 show from previous ones,
American Idol will be taking inspiration all those international editions of
Idol…

(And I have been hoping for this for soooooo long for some sick ass reason, I
swear. I have wanted to see this for some time on this shit show.)

The Top 4 will not only be performing solo renditions of classic rock songs from
the 1970s and 80s…the even number means there will be also be DUET
performances.

(I received this information from a very reliable source, BTW. Plus, what reason
do I have to yank anyone’s chain?)

As I said before, I have always wanted to see the kiddies perform duets on the
show. Probably because I am sick & twisted.

SOURCE

(Mods, this has extra info that was not posted before.)
Source

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