Alfred Brendel protege UK pianist Paul Lewis talks on the Guardian newspaper Youtube website about the Beethoven Piano Concertos, with samples of playing from the 4th and 5th concertos. Paul performed the cycle for the BBC Proms in 2010.
Paul Lewis loves the 4th Piano concerto because it's the most unusual; most ellusive, and challenging to play also (collaboratively - as you have to see eye-to-eye); something slightly unobtainable about it that draws him to it.
Paul Lewis talks with Czech conductor Jiří Bělohlávek about the Beethoven Piano Concertos cycle and further about the challenges of the 4th concerto - fragility of performing with an orchestra, minute changes of pulse, balance, and tempo. Paul also talks about the cadenzas within the concertos and what they reveal about the composer. The 5th concerto, surprisingly has no cadenza for instance! (perhaps because the piano has such a prominent role - i.e. the opening)