Yes. This work is licensed under the Creative Commons "Attribution License" which says: You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
I typically would refer to this sound effect in a list of credits for my project and call it '"A Harpsicord Dream" by zerolagtime [freesound.org - CC Attribution 3.0]' and use a URL on the license name if the medium permits. If this is printed or part of a video, I would stick with the quote above.
Good luck with your project and thanks for using freesound!
I used this sound in a play - a production of One Man, Two Guvnors - for a comic bit when a character falls down the stairs repeatedly over the course of a scene (mixed with another sound - this sound was the thud at the end of his fall). It worked great, thanks!
Please use audacity with the FLAC plugin. This sound is so nuanced that I didn't want to compress it and lose any sound data. Additionally, FLAC is an audio format encouraged by freesound.org so you will likely need to know how to convert it for other sounds later.