You'll have to take their world for it on the "sweet melody" part, though it does sound nice on the 2A03.
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So, what exactly was in Garin's Grave that we were looking for? Well, we found two things - one was a Cursed Belt that, if worn, keeps you from being able to enter Tintagel Castle, and that's not good, so selling it for gold (like I did) is the better option.
The other item -the one we were actually directed to find- is the Silver Harp. You play it on the overworld and it summons a random monster for you to fight (in this instance, a Scorpion, but it can call up other things too). You can get into random battles without even having to take a step anymore! Neat, right? ...well, that's if you prefer your monster selection to be rather limited, because it only seems to call up stuff that's significantly weaker than you.