立式钢琴

http://en.wikipedia.org/wiki/Piano

http://www.chelseapianos.co.uk/media/catalog/product/cache/1/image/5e06319eda06f020e43594a9c230972d/I/M/IMG_0203a_white.jpg

http://www.youtube.com/watch?v=rhhwfAa6raM

http://www.youtube.com/watch?v=09oNj9UYM7g