What type of solder do you use and why?

Cardas makes a "quadelectric" solder for audiophile use.

I'm not sure if this will have any bearing, (HA!), seeing from the varieties of solder here, but of the 3, wonder, wbt, cardas, I find cardas to sound the best. how much, I don't know, but it sure seems that way to me. (I don't redo solder to see if there is a difference). I haven't noticed it being any harder to work with, in fact, they are all easy, these 3. I have noticed a noticable improvement washing the surfaces with xlo contact cleaner. I have not found any cold joints with this yet.

Cardas uses a quad-eutectic formulation which has lead, tin, copper, and silver. The point to this is that you would like the solder to contain at least a small amount of whatever metal you are soldering to, so that on a molecular level you get a very good bond. When used with copper wire, silver wire, silver-plated wire, and silver-rhodium plated connectors, I feel it is the best. If you want to save some money, though, plain old 63/37 is an excellent choice (avoid the more common 60/40; it is not eutectic).

Well there is a lot of good solder here. I'll go for Rat Shack lead free stuff. I think it has a 2-3% silver content. It won't kill your brain cells (I'm biased here as I have precious few left to waste) and can be bought around the corner. I have to admit though that my favorite dog is a mutt.

Sincerely,
I remain

Go for the 2%Silver w/ lead containing solder. Not the lead free.

The lead melts, it doesn't vaporize.