
gesalt |

There are 4, but warrior muse is a bit of a joke, so it's easy to forget.
Of the muses, Maestro and Polymath have strong initial abilities while Polymath has better higher level feats. Enigma has a couple at 16 and 18 too. You could definitely open with multifarious muse at 2 and 4, dirge at 6 and then start picking up Polymath and Enigma feats.
I suppose it'd look something like:
01 Lingering Composition [from Maestro]
02 Multifarious Muse (Polymath)
04 Multifarious Muse (Enigma)
06 Dirge of Doom
08 Esoteric Polymath
10 free space
12 Eclectic Polymath
14 free space
16 Studious Capacity
18 Deep Lore or Impossible Polymath
20 Perfect Encore or the other 18 feat
You even have the free space to pick up warrior muse if that's your jam.