interestingly this challenging work only became popular and well known after Horowitz popularised it in the 1930’s, more than two decades after Rachmaninov gave its first public performance in New York in 1909, the year of its composition
It’s such a haunting opening melody, so full of melancholy. Your link at 40 mins or so (I’ve not played it all through) seems to be the full work rather than the shortened version on some older recordings (authorised by Rachmaninov apparently)