Aboard the MS Maasdam.
Every other night, after the dining and the shows and things were winding down, I'd wind on down to the Piano Lounge, prop myself up on a bar stool and have a martini while listening to the piano man. Although he sucked, it was very cool that after the first night, every time I entered, whether or not there was a crowd, he'd play "You Can Leave Your Hat On". It was also very cool that the server knew exactly how I liked my martinis and all I had to do was smile and life was good.
I have to add that the piano playing improved dramatically after two martinis.
*Holland-America Lines is based out of Seattle, WA and I'll correct that info when Yelp HQ changes the title to Piano Lounge.