This game is best described as Klondike with two decks. You have ten piles on the table, and of course eight foundations.
>Topic<General comments
The Harp is quite a bit easier than Klondike.
>Topic<Rules
See Klondike.
>Topic<Strategy
You have some advantage of having two of each card. Many endgame deadlocks can be solved by building on only some foundations and re-arranging the table by moving parts of piles to each other.
>Topic<Source
This game was listed in the "harps" section of one of my game books, together with Klondike.