We put together a drum track to start, decided it would be in Em and then each had at it with no idea what the other guy was going to do. Knowing my friends, I knew it would lean towards heavy rock so I did a
slide part to reflect that. Mine is the first 3rd and bits here and there later. 3 drummers,2 bass players,2 rhythm players, and 3 of us did lead. It came together without any of us hearing each others takes before hand. My bit was my second run through. I used a 90's distortion tone. Worked great for slide.