The Big Lyre is located just South of the Goddess of Wisdom statue. The first Small Lyre is found East-South-East of Athena’s Sanctuary near the border with the Eternal Spring, and the second Small Lyre is in the middle of the North banks of the lake in the North-East corner of the Grove.
Small Lyre #1: B-A-C-D
Small Lyre #2: A-D-C
Small Lyre #1
Found in some golden ruins East-South-East of Athena’s Sanctuary near the border to the Eternal Spring, and guarded by a Minotaur, two Gorgons and two Harpies. This is part of a puzzle to get to a Small Lyre: the goal is to light up four Crystal Switches among the golden ruins to open the door into the cave.
For the middle switch, smash the Corruption Crystal to reveal an unlit torch: use one of the fires flanking the statue in front of the doorway into the chest’s cave to light an Apollo’s Arrow and light the torch. This will unlock the Crystal Switch for you to use.
For the left-hand switch, push the Heavy Metal Blocks one-by-one to lower the barrier doors and get them onto the Heavy Metal Plates, eventually activating the one next to the Crystal Switch below. To weight down that one, push the very first Heavy Metal Block off its Pressure Plate and down the stairs, which will land on the one next to the Crystal Switch and activate it.
For the right-hand switch, look for the Hero Plate and stand on it to lower a barrier in the nearby gold building. Look left for a cracked wall and smash it down to reveal a bunch of Metal Boxes. Grab one and toss it through the exposed hole to weight down a Pressure Plate, lowering another barrier up on the left. Toss two more Metal Blocks through here to weigh down a Heavy Pressure Plate to unlock the Crystal Switch!
This Lyre’s code is B-A-C-D
Small Lyre #2
Found in some ruins up a cliff on the North bank of the lake in the North-East corner of the Grove, near a stone Athena statue, and guarded by a Hammerman and two Gorgons. To open the barrier door inside, stand on the Hero Plate in front of the building to unlock two unlit torches, then fire Apollo’s Arrows through the lit torch in order to light them.
This lowers the barrier between the two stairs. Head inside and smash down the cracked wall behind the Heavy Pressure Plate to reveal a room with three Heavy Metal Blocks. Push the back-right one to the back of the room, then the middle one to the side. This lets you push the front-most one through and onto the Heavy Pressure Plate, lowering the barrier doorway on the building outside!
This Lyre’s code is A-D-C