★★★★ THE PRODUCERS, GARRICK THEATRE Musical mayhem in Mel Brooks' meisterwerk You probably know what's coming, but it's such great fun! Unexpectedly, there's a sly reference to James Joyce's Ulysses interpolated into Act One (in case we hadn't caught the not so sly one, naming a leading character Leopold Bloom). While that's a nice callback from brash commercial Hollywood to the high …