I have the classics in a Les Paul - and they are definitely in the vein of the EMG57/66 set in voice 1. The classics are my favorite of the Fluence Line - I tend to like a brighter tone. I took out the 57/66 set in a 7 string for the moderns. It is a great set, but I had some noise issues with mine, which is weird for active pickups - they otherwise sounded fine. No complaints about the classics though - they sound awesome for just about everything to my ears - really my favorite pickups.