Legend of Zelda Spirit Tracks?

Ok- first question. At the Goron Village, on the ledge where there are 3 vases, supposedly playing the Song of Discovery reveals a hidden treasure chest. It does not work for me at all.
2nd- the third door at the “game room” in Castle Town?
I have finished 1 & 2, but I am asking how much farther this one goes?
I am almost finished with this game ( I have the Lokomo Sword, all 20 Force Gems, the 2 scrolls from 20 stamps and 50 Rabbits, and finished all side quests up until retrieving the Compass of light EXCEPT for Slippery Station (I only got the first door done)
the hint about the hidden chest is in the game guide. For Demon fossils, I suggest going to Whittleton, and blowing all the leaves around, entering the path to the northeast, then going back again and again till you have what you need- also has lots of woodhearts and star fragments there!

ok for the first umless im mistakin i havent heard of a herd of anything about that. it might be just a rumor

for the second all the tips i have for you is to roll as much as possible

BUT I NEED TO KNOW HOW TO GET ALOT OF DEMON FOSSILS

Spirit Tracks COMPLETE Walkthrough 17(Opt)- BombBag#1, Chests in Town, Tower of Spirits1F-3F(S●#8)