Yes.

JB

what about the Band Hero controllers with Rock Band games? will they work on the wii?

Here is a link to the official cmpatibility chart for Guitar Hero and Rock Band software and the games they will work with.  It also breaks it down by system.  The XBox 360 seems to have the best when it comes to what hardware will work with what games, but the Wii breakdown isn't too bad.

To fully answer the question, the Band Hero hardware (which is equivalent to the GH5 hardware - that's why you don't see it on the list) will work with Rock Band 2, but not original Rock Band, unfortunately.

JB

So can you confirm if the Beatles Disc is compatible with the Band Hero Kit??

I can't imagine any reason why not.  Isn't the Beatles game based off of the same format as RB2 (similar to how BH is based off of GH5)?

JB