Recorder

In the first two Zelda games Link acquires the Recorder

The Legend of Zelda
Allows you to warp to any dungeon you have cleared. If you are facing north or west, you warp to the next dungeon. If you are facing south or east, you warp to the dungeon before the one you are at.

Adventure of Link
Acquired in the game's fifth palace, the recorder allows Link to pass by what the villagers in the town of Nabooru call the River Devil. Once the recorder is played, this troublesome roadblock disappears.