I'm not a big fan of harp music per se, but this Belgian CD contains a beautiful Harp Quintet ( Notturno) together with couple of short trios on Mozart themes. The composer's dates are attractive too: 1769 - 1861.
CD 5050 12 : Harp & Co.
Any information on the composer?
there's a couple of things at IMSLP here -
link (http://imslp.org/wiki/Category:Marin,_Marie-Martin_Marcel) (with a link to a 1825 biographical dictionary that contains some contemporary biography.)
I had looked him up in several reference books to no avail until I refined my search to " Marin" rather than "Marcel".
Groves gives him excellent reviews.