The internationally-renowned concert pianist Orli Shaham is deep into a multi-year endeavor of recording all of Mozart’s piano sonatas. “As a young musician, Mozart traveled widely and — like any good traveling salesman — needed samples to show off to prospective patrons. So, during a journey to Munich in 1774–1775, he wrote six ‘calling cards’ to play at the homes of potential benefactors,” writes Shaham. Three of these calling cards — the sonatas K. 280, K. 279, and K. 284 — are on Volume 4 of Shaham’s series.