The ugliest thing you will ever see in an antique anything is a phillips
screw.  A player piano with a phillips screw in it is a screwed up player
piano.  Unless it was built in the 1970's.  If it was it's not worth anything
anyway.  The best thing to do when restoring antiques is to buff off the rust
if possible or find new blued steel screws to replace the old ones.  Old
hardware stores are good sources for these.  After buffing the original screws
you can reblue them with heat or paint them with tuning pin blue or the easy
thing to do is get yourself a can of blue machinist's layout fluid and spray
them.  They will look like new old after that.  I sure hope the guy who
recommended changing all the screws to phillips does not work on anything of
value like an orchestrian or music box.  Imagine opening up a fine swiss
music box and seeing shiny modern phillips screws staring out at you.  YUK.