A common genre on the piano since Franz Schubert, there are far fewer impromptus for the harp than one might think. Sarah O'Brien, longtime principal harpist of the Concertgebouw Orchestra Amsterdam and the Munich Philharmonic, presents here a compendium of all impromptus for harp. She has collected both well-known works and surprising rarities, which she supplements with 20th-century compositions and spices up with a few 18th-century gems that are also ideally suited as arrangements for her instrument.