I always thought that the track for Forest Temple from the video game "The Legend Of Zelda: Ocarina Of Time" was
perfect for
the Old Forest in "Lord Of The Rings".
It has the exactly same type of hauntingly peaceful and creepy atmosphere;
the kind of feeling that you are being watched by something mysterious that tries to steer you onto the wrong path.
In the game, this is pretty much the enemy "Wall Master", which is a huge hand that falls from the ceiling and grabs you, which then forces you to teleport back to the main entrance (the first game had it come out from the
walls instead, which is why it is called "Wall Master").
"Forest Temple - The Legend of Zelda: Ocarina Of Time"