After 30 odd years it's about time somebody told me wtf is going on with the guitar harmonies on this song. Lets get the low hanging fruit out of the way first... Yes... its tremolo. In fact, many loosely synced tremoloes with a 1/16th gated sidechain compressor to lock it all in. Yes... he used a capo on the 2nd Fret. Yes... there are multiple overdubbed guitar parts triggered from loops. Here's what I need to know. The F# Tremolo'd chug..... does it stay on F# right through the song? This is what I hear. All the other chord changes are played over a constant, never changing F# Major chord... like a "pedal tone" ... but more of a "Pedal Chord". I know everyone, including the guy who wrote the tab plays it F#---F#---F#---A-B- I just don't seem to be able to hear that Tremolo Guitar change pitch?? Am I going mad? The "Howling Siren" repeating phrase. Is this a guitar part that was recorded and then played backwards through masses of reverb? If the answer is Yes... How do you play the original guitar part (the forwards version)? Is it just one or multiple guitars? What notes are they? If the answer is No.... how on God's Earth does he get that "crescendo" swell into the notes? I see people play it with a slide... just the top note... but that sounds thin and empty. Not mocking... I would love to know how Marr did it. I am hoping there are at least a few musical geniuses here with perfect pitch to help me out. Thanks.