A Piano has a Stool.
An Organ has a Bench.
If you’re ever in a Music School, Academy etc, then please remember the above, otherwise the Tutors tend to get upset, and if you are a Student, then you are informed of your error in no uncertain terms.
Personally you can call it whatever suits, but I just thought I would mention it.
Here is a link for those who like plenty of padding http://www.chamberlainmusic.com/productdetail.asp?ProductID=KDT5505
Enjoy whatever you’re seated on

Bill