I wouldn't mention the keyboard at all you'e the star not the keyboard. If it was for my kids I wouldn't care if you played keyboards, guitar or recorded music as long as the entertainment aspect was there. variation's I like so far are.

Mikey creates a wonderland of music and entertainment playing all the favorites kids love to listen to and sing-a-long with
or
Kids Join Mikey's Band! Sing your favorite songs
or
Have your kids Join Mikey's Band! Sing their favorite songs