There seems to be much confusion around the correctly corresponding route and names of Fat Pig and When the Fat Lady Sings. My understanding is that Fat Pig is the low anchors and that When the Fat Lady Sings is, logically, the extension. Consensus these days seems to be 13a for Fat Pig and 13b for Fat Lady. The Fat Lady takes considerably more endurance to send than the one move wonder of Fat Pig. It is also a drastically superior route with the top section turning it into a full-value route with awesome exposure and super fun moves. The best at Shagg in my opinion.