If my math is correct I don't believe the Fatesinger lvl 0 passive is working by adding new songs. I have 26 prior to selecting Fatesinger and 30 after (lvl 5 FS) where I had 42 prior to the update. While playing with this bug on Lam (report was submitted) I believe it was dirge disabling it (a single point in dirge would shut off the ability).
Can anyone else confirm?