Mahan Esfahani, the young Iranian-American harpsichordist, is becoming one of the most ardent promoters of the instrument today. After a formation that included studies with Australian harpsichordist, Peter Watchorn, he has been bringing the music to new audiences, including the first ever solo harpsichord recital presented at the BBC Proms in 2011.

Esfahani is clearly captivated by these sonatas from one of the Bach clan’s most notable scions. Written just before Carl Philipp Emmanuel turned 30 and published in the year he married his wife, the sonatas are dedicated to one of his former students, the Duke of Württenmberg. They embody the marvellous (and mischievous) nonconformist musical attitudes of the age by juxtaposing seemingly random and unconnected passages as part of a whole. This presents the performer with numerous expressive possibilities as well as considerable interpretative challenges.

Using a beautiful instrument (which includes an unusual four-foot “flute” register) based
on the work of Michael Mietke (1671-1719), maker of harpsichords to the Berlin court, Esfahani delights in the extraordinary range of colour, texture and mood in these pieces. All is sensitively recorded by Hyperion’s engineers.

Whether it is the caprice and operatic mock-seriousness that opens the Sonata in B Minor or the vocally inspired material of the Sonata in A...