I think these are Orienpet lilies, which are a hybrid of Oriental and Trumpet lilies. This one is a very soft yellow with ivory. I think it came in a "collection" from White Flower Farm, so I don't have a name for it.
The scent isn't as sweet as an Oriental lily but is still rather heavy and, honestly, I'm not crazy about it. In my experience, the tall lilies (this one is about five feet) are pretty easy to grow and don't need staking.