Has anyone here tried to do this? I've listened to David Lucas Burge's course but haven't put much time into doing the exercises yet. I am interested in other people's experience and whether anyone has had the same odd experience I have had. What I've found odd is that I can't hear any difference at all between the character of an F# versus an Eb (concert pitches) like he suggests listening for in the first exercise, yet I can recall a certain tone with no reference quite reliably (about 7 out of 10 times) if it is the first note of something I have been practising a lot recently. Just being able to hear a difference is supposed to be the very first step while he describes aural recall as the most refined level of perfect pitch (naming notes as you hear them is somewhere in the middle). So I seem to have fleeting glimpses of supposedly the most difficult aspect of perfect pitch while having nothing to build the basics on.