Set your pickup switch wherever you like the sound on the particular piece you're working on. Dont focus too much on sounding like other artists...there are just so many variables, you will end up forever chasing that illusive tone rather than focusing on your playing technique, which ironically enough is where a lot of your tone will come from. Type of guitar, technique, pickups, effects, amps etc are all factors. Generally I set the selector swith to the neck position if i want a tubular type of sound similar to SRV or Clapton on a strat. With Clapton though you will want a dirtier distorted setting on your amp. Maybe not the case so much with Wonderful Tonight as that is a softer ballad, you can get away with a cleaner sound signal but id stay away from the lower switch settings as they sound too twangy for that song.