My favourites are the early clarinet sonata, the wonderful Meditations from Mass arranged for cello and orchestra for Rostropovich, and West Side Story. Also very partial Candide, On the Waterfront, Violin Serenade and Jeremiah - the other two symphonies, aside from a few lovely moments, largely leave me cold. The rumour has always been that he was frustrated that he had never produced an enequivocal masterpiece... I think I agree that nothing he wrote is amongst the very finest of 20th century works, but alot is very good indeed, and I like his music a lot.