I am stuck on zelda ocorina of time can any one help?/?

im in the spirit temple and i go into this room on the 1st floor and there are three giant boulders rolling back and forth and at the other end there is this door where inside is a trunk that i already opened but i dont know what i got and there are 6 holes in the wall and a block with a sun in the furthest on the left and i go up to it and i sing the sun song and it moves over a hole and then navi goes into the hole where it was originaly was and turns green and the a on on the screen doesnt change and i dont know if i should sing one of the songs or throw a bomb or what so what do i do? ps remember im in the spirit temple on the first floor