I have the Water Music shown above but in those days I usually went to Marriner for baroque orchestral, except for the Fireworks Music where I favoured Mackerras and his massive wind ensemble. I have several albums of Leppard accompanying Janet Baker and a box set of Monteverdi madrigals but it was his realisation of Monteverdi's L'Incoronazione di Poppea that had the biggest influence on me. I never heard him conduct it live but it was the first Monteverdi I ever heard, a live performance, in English, by the Sadler's Wells Opera Company (later ENO); I have been hooked on Monteverdi ever since. I now have a CD of the Glyndebourne production conducted by John Pritchard, mainly now for nostalgic reasons as it hopelessly un-HIP but great fun (as far as the rather grisly plot allows).