Michael Berkeley’s guest is Vincent Cable, Deputy Leader and chief economic spokesperson of the Liberal Democrat Party. A passionate music-lover, his choices include Mozart’s D minor Piano Concerto K466 played by Murray Perahia, and a selection of fine voices ranging from Luciano Pavarotti in Verdi’s Requiem to Nicolai Gedda in Mozart’s `Don Giovanni’ and Jessye Norman in Strauss’s Four Last Songs.