Tchaik's. Tied for 2nd are the Beethoven*, Brahms, and Sibelius, with the Mendelsohn close. I love the Barber until the 3rd movement, so it's gorgeous-but-short for me.
* Did you know that Ludwig himself wrote a 6th piano concerto by adapting the VC to the piano? It was startling for me the first time heard, but I really like it. My favorite performance (of the few) is Spada's with Gibson and the Philharmonia on ASV.
* Did you know that Ludwig himself wrote a 6th piano concerto by adapting the VC to the piano? It was startling for me the first time heard, but I really like it. My favorite performance (of the few) is Spada's with Gibson and the Philharmonia on ASV.