Well, I guess you could call Fatum an 'unsung work'...
I have heard the Gauk recording, it has to be the slowest and most ponderous performance around! The Detroit/Jarvi version is very good, he whips up a lot of excitement even though the opening idea is still taken very slowly. Eliahu Inbal's Frankfurt Radio Version is good too. But the best version I have ever heard (and I've heard pretty much all of 'em!) would be the Bochum Symphony Orchestra performance conducted by Othmar Maga on Vox. Even the terrible coda hangs together for a change!